C6 Corvette Grand Sport buyer's guide (2010–2013): dry-sump coupes, specs, problems and prices

GM sold the Grand Sport for 2010–2013 as RPO Z16 (an RPO is GM’s regular production option code), coupe or convertible, in every trim from 1LT to 4LT, and GM’s launch release (opens in new tab) said it “replaces the Corvette’s previous Z51 package.” What the package added, per that release and GM’s 2010 order guide:

• Body. Wider front and rear fenders with Grand Sport badges built into the front fenders, a Z06-style front splitter and tall rear spoiler, and functional brake ducts. The car is 75.9 in wide, against 72.6 in for a base C6.
• Brakes. The Z06’s sizes: 14-inch front and 13.4-inch rear rotors, six- and four-piston calipers, all cross-drilled.
• Chassis. Stiffer springs and anti-roll bars, its own shock absorbers and extra cooling. The order guide aimed the package at “the Gymkhana/Autocross enthusiast.”
• Wheels and tires. 18 x 9.5 in front, 19 x 12 in rear, on Goodyear Eagle F1 Supercar run-flats.
• Gearing. Manual cars got their own shorter ratios; automatics got a 2.73 axle in place of the base car’s 2.56.

Grand Sport or Z06? GM said the Grand Sport’s suspension “approaches that of the Z06.” The differences: the 430 hp LS3 instead of the Z06’s 505 hp LS7, so none of the LS7’s cylinder head question; a removable roof on the coupe, where the Z06’s is fixed; and a convertible and an automatic, which the Z06 never offered. It’s heavier too. GM listed 3,311 lb for a Grand Sport coupe against 3,175 lb for a 2010 Z06, and MotorWeek put the gap down to the Grand Sport’s steel frame. Car and Driver called it “the thinking man’s Z06,” $19,515 cheaper in 2010.

Grand Sport or base C6? Same engine, same 430 hp, and about 100 lb more than the 3,208 lb GM listed for a 2010 base coupe. With destination, a 2010 Grand Sport coupe cost $5,840 more than a base coupe: $55,720 by GM’s price release against $49,880 in a dealer’s posting. That money bought brakes, grip and width, not horsepower.

The name goes back to the five Grand Sport race cars Zora Arkus-Duntov had built in 1963, GM’s release notes, and to the 1996 Grand Sport: 1,000 cars in Admiral Blue with a white center stripe and red hash marks on the left front fender.

C6 Grand Sport horsepower, by GM’s SAE-certified rating: 6.2-liter LS3 V8, 430 hp (436 with the dual-mode exhaust). That’s the same as a 2008–2013 base car; the hub’s spec table sets it beside the Z06 and ZR1, and the C6 spec page has every C6 by year.

Sources: GM’s 2010 Grand Sport release and specification table, GM’s 2010–2013 order guides (the same weights all four years), the 2010 owner’s manual’s capacities and fueleconomy.gov’s current ratings.

One table to ignore: GM’s 2013 press guide prints 0.74, 0.50 and 2.90 for the Grand Sport’s fifth, sixth and reverse. Those are the base car’s ratios from the column beside it, an apparent copying error. GM’s own 2010 Grand Sport table, GM’s 2009 table for the Z51 gearbox the Grand Sport kept, and Bowling Green’s 2013 production records give 0.71 fifth and 0.57 sixth (the 2010 Grand Sport table prints sixth as 0.56).

How fast is a C6 Grand Sport? GM claimed 0–60 mph in four seconds, 1 g on the skidpad and 26 mpg on the highway. GM published no top speed for it, and the base car’s figure belongs to a narrower car with other gearing. The tests:

Car and Driver estimated that convertible’s top speed at 185 mph, an estimate rather than a run. Its scales read 66 lb over GM’s curb weight for the coupe and 92 lb over it for the convertible (this site’s arithmetic), on test cars with options fitted.

Then there’s the price. In Car and Driver’s July 2010 comparison (opens in new tab), the $67,565 Grand Sport ran the quickest quarter mile and the best lap time of the three, against an $80,695 Porsche Cayman S and an $85,270 Lotus Evora, all as tested. The Porsche won the comparison. The Corvette still did the speed for $13,130 less.

Not every C6 Grand Sport is dry sump: only the coupe with the six-speed manual. GM’s 2010 order guide (opens in new tab) lists RPO Z52, a package that “includes dry sump oil system, rear-mounted battery and differential cooler,” as standard on the Grand Sport coupe, deleted when the automatic is ordered and not offered on the convertible. The later order guides, GM’s 2012 and 2013 press guides and the 2013 owner’s manual all agree. The 2010 owner’s manual doesn’t: it gives the dry sump and the rear battery to every Grand Sport. Go by the order guide.

A dry sump keeps the oil in a separate tank and pumps it back there from the pan. By Bowling Green’s tables as Corvette Action Center reproduces them, the plant built 1,468 dry-sump coupes for 2010, about 1,699 for 2011, about 1,628 for 2012 and 1,515 for 2013: about 6,310, a little over one Grand Sport in five. (The 2011 and 2012 figures are the plant’s coupe totals less its automatic coupes.)

It’s more than plumbing. GM’s bulletin PIP4768B (opens in new tab) lists what the Z52 LS3 gets that others don’t: a higher-flow, higher-pressure two-stage oil pump, a forged steel crankshaft “similar to LS9,” tri-metal main and rod bearings shared with the LS7 and LS9, and a higher-pressure oil filter. The same bulletin warns that the 0–80 psi oil gauge may peg at full scale on some cold starts and read higher than in other LS3 cars. With no oil pressure sensor code stored, GM calls that normal.

Owners in 2010 compared the builders’ nameplates on their dry-sump engines, which they say were assembled at GM’s Wixom Performance Build Center, and MotorWeek called its test car’s V8 “hand-built.” No GM document found for this guide says so: treat it as the owners’ and MotorWeek’s word, as the 2010 guide does.

Living with one: 10.5 qt (9.9 L) of oil with the filter, against 6.0 qt for every other LS3, and GM’s higher-pressure UPF-48R filter (12626224, OEM) instead of the PF48 (89017524, OEM). There are two drain plugs (18 lb-ft each, filter 22 lb-ft), and the fill goes into the tank, per the 2013 owner’s manual. Check the level warm, GM’s way: at least 175°F (80°C), engine off, then read the dipstick in the tank after 5 to 20 minutes. The battery rides in the right rear storage compartment with jump terminals under the hood; the Corvette battery guide covers it.

Owners’ quick test is the battery: a battery in the back means a dry-sump car (opens in new tab), and a manual Grand Sport convertible has neither. Then raise the hood and find the oil tank with its own dipstick on the driver’s side.

Production: Bowling Green’s figures as Corvette Action Center reproduces them; totals and shares are this site’s arithmetic. Prices: GM for 2010 and 2011, with the $950 destination charge; Corvette Action Center’s 2012 list plus the $975 destination charge; Vette Vues for 2013, which doesn’t say whether destination is included.

The drivetrain never changed, by GM’s 2012 and 2013 press guides, and owners agree. What changed was around it.

2010. The launch year. Launch control on manual cars and side airbags on every Corvette. The Heritage package (Z15) added fender hash marks in four colors and two-tone seats with Grand Sport embroidery, on 1,531 cars, and chrome wheels went on 4,693 of the 6,042.

2011. Magnetic Ride (F55, $1,695) became available, bringing Goodyear’s Gen 2 Supercar tires when ordered on a manual car; 2,051 Grand Sports got it. Heritage peaked at 2,059 cars. Coupes built from January 24 to September 1, 2011 fall into a hatch hinge recall (see C6 Grand Sport problems).

2012. New seats with bigger bolsters and a new steering wheel, the interior change owners name as the main difference between years. The Centennial Edition went on 1,568 Grand Sports, black Grand Sport fender badges (BA5) on 2,293 and Magnetic Ride on 3,115. The Grand Sport’s share peaked at 62.9 percent.

2013. 60th Anniversary badges on every car, and the full 60th package (Z25) on 658 Grand Sports. Black-painted Grand Sport wheels replaced Competition Gray, and Night Race Blue was new.

No recall covers the Grand Sport alone. One reaches it: recall 11V491000 (opens in new tab) covers 2011–2012 coupes built January 24 to September 1, 2011, whose rear hatch hinges might not meet the federal standard, so the hatch could separate in a crash. Dealers replace both hinges. No convertible is included.

NHTSA files 307 owner complaints against 2010–2013 Corvettes (pulled October 30, 2026) and doesn’t separate the Grand Sport. This site read the VIN stored with each, by its fifth character as NHTSA’s decoder reads it, and found 157 Grand Sports: 34 for 2010, 51 for 2011, 37 for 2012 and 35 for 2013. They’re 54.7 percent of the 287 complaints with a usable VIN, against 55.0 percent of production: no sign of a weaker car. Each complaint was read and given one theme, so the themes are this site’s reading.

Fuel smell. Six complaints in ten, including 23 of the 40 about manual coupes. The usual story is fuel smell in the garage after a fill above half a tank, from the left-hand module’s flange, which GM’s Special Coverage 15682 (opens in new tab) covered for 10 years or 120,000 miles. That coverage has expired, and complaints keep coming: one 2011 fixed free under the program in 2022 was leaking again in 2026. Owners have reported repair bills of about $1,600–4,000 since 2015.

Warning lights. The airbag light usually traces to the power seat’s connector (Special Coverage 15643, expired); several owners say it clears when the seat moves. Twelve complaints describe Active Handling, ABS or traction warnings, several with a front brake grabbing or the car braking itself; one owner traced the fault to a steering wheel position sensor pushed out of its housing by the power telescoping column. This guide found no recall or bulletin for it on 2010–2013 cars.

Shifter and tires. Six automatic owners describe a shift cable that broke or came off, leaving the lever stuck in Park or Drive; no GM bulletin was found. Three describe the run-flats floating on standing water.

What’s missing. No complaint mentions the dry sump, oil pressure, valve guides, the gearbox internals or a cracked wheel. One 2011 manual coupe’s owner reports an underhood fire, with a misfire and a broken valve spring diagnosed by the dealer: the only Grand Sport complaint describing an engine failure. Read the counts as failure modes, not a reliability score.

Shared C6 paperwork. Special Coverage 14717 (clutch hydraulics, expired) names the Grand Sport’s MZ6 manual. The rest apply to every late C6: program 14203 for low beams (jumper kit 23273949, OEM), PIP4750F for balancer wobble (replace only past 0.0157 in, 0.40 mm, of runout) and PIC5202E for a steering-wheel shake at 72–78 mph from tires flat-spotted while parked. The C6 buyer’s guide has the generation’s full record.

A set of wide fenders is for sale to anyone, and kits to make a base car look like a Grand Sport turn up in search results for the car itself. Owners on CorvetteForum say converting a base car is rarely worth the money (opens in new tab), so a look-alike is usually a base car wearing the look without the brakes and the rest of the package. Three checks settle it.

The VIN. It’s on the driver-side front corner of the instrument panel. By NHTSA’s decoder, the fifth character is P, R, S or T on a manual Grand Sport and U, V, W or X on an automatic (one letter per trim, 1LT to 4LT); a 2013 with the 60th Anniversary package can read 3 (manual) or 4 (automatic). The sixth is 2 for a coupe and 3 for a convertible, and the eighth is W, the LS3. So a dry-sump car reads 1G1Y, then P to T (or 3), then 2. That’s NHTSA’s pattern; no GM VIN chart for these years turned up.

The option label. The Service Parts Identification label is “on the inside of the glove box,” per the 2010 owner’s manual. Every Grand Sport shows Z16. Look for Z52 on a dry-sump coupe, Z15 (Heritage), F55 (Magnetic Ride), MZ6 (manual), NPP (dual-mode exhaust), ZLC (2012 Centennial), Z25 (2013 60th package) and BA5 (black badges). Don’t be thrown by Z51: Bowling Green counted it on every 2010 and 2013 Grand Sport, though GM said the Grand Sport replaced it.

The car. Grand Sport badges set into the front fenders, brake cooling ducts, six-piston front calipers and Grand Sport five-spoke wheels (silver, Competition Gray or chrome; black on 2012 Centennials and 2013 cars). On a manual coupe, the oil tank under the hood and the battery in the back. Hash marks prove nothing: anyone can add stripes, and only Z15 on the label proves the Heritage package.

The 427 Convertible. GM’s 2013 order guide builds it on the Grand Sport convertible’s model code (1YG67), with the Z06’s LS7 and Z06-style carbon fenders. GM sold it as the 427 Convertible Collector Edition, never as a Grand Sport, and NHTSA’s decoder gives it its own fifth characters. The 2013 guide covers it.

1. VIN and label agree. Fifth character, Z16, and on a manual coupe Z52, matching what the seller says.
2. The hatch recall. On a 2011 or 2012 coupe, have a dealer confirm 11V491000 by VIN.
3. Fuel. Fill above half, let it sit, smell around the rear and look under the left tank. Ask for module receipts.
4. Dry-sump oil level on a manual coupe, checked warm as the manual describes. A pegged gauge on a cold start is normal by GM’s bulletin; a stored oil pressure code isn’t covered by it.
5. Warning lights. No airbag, Active Handling, ABS or check engine light.
6. Clutch. The pedal comes all the way back every time; ask whether the master cylinder was replaced.
7. Automatic shifter. Clean moves into and out of Park and Drive.
8. Brakes. The 2013 owner’s manual says a manual Grand Sport coupe’s pads have no built-in wear indicators: look through the wheel, replace at 2 mm, and heed a CHANGE BRAKE PADS message.
9. Tires. The right sizes front and rear, matched brands, and a plan for a flat if the run-flats are gone.
10. Belt and balancer. A squeaking belt or a balancer that seems to wobble means the runout should be measured, as PIP4750F describes.
11. Rear toe links. The 2010 manual gives every Grand Sport greaseable outer ends; the 2013 manual names only the manual coupe. Look for the fittings, and ask whether they were greased.
12. Track history and modifications. Receipts, and who did the work. Then a pre-purchase inspection by a shop that knows C6s.

About $38,000–39,000 at the middle of the market. Bring a Trailer (opens in new tab) listed 27 Grand Sports from January 1 to October 30, 2026, and sold 22 at a median of $38,875 by this site’s count. Without the modified cars (a supercharger, Callaway, Lingenfelter or “Modified” in the title), 18 sold for $23,900–$53,006, a median of $38,150.

The samples are small, and low-mileage cars pull the medians up. Titles don’t always name the gearbox, so the six-speed row is a pointer, not a measured manual premium. The top sale was a 7,000-mile 2013 3LT six-speed coupe at $53,006 in October; the lowest, a 2011 3LT convertible at $23,900 in August. Earlier 2026 windows on the C5 vs C6 and best years guides counted fewer sales and found medians of $38,525 and $37,800.

In 2025, 18 sold at a median of $38,250, modified cars included, so the trend is flat. That’s a record of what sold, not a forecast. Other price guides bracket it: classic.com’s benchmark was $40,955 in a February 14, 2026 capture, and Hagerty valued 2010–2013 Grand Sports at $32,400–32,700 in #3 (“Good”) condition, on values dated July 2025 to January 2026, for a manual car, less 10 percent for an automatic.

Against the other C6s. A C6 Z06 costs more: 21 sold on Bring a Trailer from June 15 to September 30, 2026, at a $50,300 median with modified cars included, and $46,856 for the 13 not described as modified (C6 Z06 guide). That’s about $8,700 above the Grand Sport’s unmodified median, over a different window. A base car costs less: the year guides record single Bring a Trailer sales of a 2010 coupe at $23,000 (December 2025) and a 2011 coupe at $25,750 (September 2026).

Fuel. GM recommends premium (91 octane or higher) for the LS3, with 87 acceptable at a small cost in acceleration (2012 owner’s manual). The EPA rates it the same as any LS3 Corvette: up to 26 mpg on the highway for a 2010 manual.

Oil. 6.0 qt with the filter in a wet-sump car; 10.5 qt and the UPF-48R in a dry-sump coupe, for which the 2013 manual recommends Mobil 1 dexos1 oil.

Tires and brakes. Owners on CorvetteForum say the upkeep matches a base C6 apart from tires, bigger brake pads and, on a manual coupe, the bigger oil change. An owner told NHTSA in 2012 that swapping off the original Goodyears cost $2,000. This guide found no current price for a set in 275/35ZR18 and 325/30ZR19, so get quotes.

On track. For racing, the 2010 owner’s manual calls for brake fluid with a dry boiling point above 534°F (279°C), oil at or near the upper mark, and greased rear toe-link ends at the end of each racing day.

Storage. A Grand Sport that sits for weeks belongs on a battery maintainer; on a dry-sump coupe, owners clip it to GM’s remote jump terminals under the hood, and that guide covers the hookup.

The pick is a 2012 or 2013 manual coupe: the dry sump, the better seats, and the hub’s best C6 years in their most capable LS3 form. Buy one with Z16 and Z52 on the label, fuel module receipts or a clean above-half sniff test, and a clutch that returns cleanly. Bring a Trailer’s 2026 medians for unmodified 2012 and 2013 Grand Sports were $44,250 and $41,000, a few thousand below the $46,856 median for Z06s not described as modified.

The comfortable alternative is a 2011–2013 automatic or convertible with Magnetic Ride: the same body, brakes and badges, and an ordinary wet-sump LS3. Unmodified convertibles sold for a $37,500 median in 2026.

The budget path is a 2010 or 2011, a convertible especially: 2011 had the lowest 2026 median ($33,333), and the cheapest sale was a 2011 convertible at $23,900. Pay Z06 money only for the LS7 with head records in hand, and buy a base car only well under Grand Sport money. Walk away from any Grand Sport whose VIN or label doesn’t back up its fenders, or that smells of fuel with no plan.

Get it right and you own the C6 that more than half of its last four years’ buyers chose: America’s sports car with Z06 brakes and width, 430 hp and nothing to prove. Take it to an autocross, the event GM’s order guide aimed it at, launch it on the 325-section rears, and see how much car $40,000 still buys. For the faster C6s, see the Z06 and ZR1 guides.