C7 Corvette Z06 buyer's guide (2015–2019): the heat question, the wheels and what to check

GM rated the Z06 at 650 hp in June 2014, the most powerful production car it had ever built: 12 hp more than the LS9 in the C6 ZR1 and 180 lb-ft more than the LS7 in the C6 Z06.

• Engine. A 1.7-liter Eaton Roots-type supercharger making up to 9.7 psi of boost, its intercooler on a coolant circuit separate from the engine’s (GM bulletin 17-NA-408). That circuit comes back in Track overheating. Forged pistons, titanium intake valves and a dry sump are standard.
• Gearboxes. A seven-speed manual with Active Rev Match, GM’s automatic rev-matching, or an eight-speed paddle-shift automatic, the first automatic GM offered in a Z06.
• Body. A coupe with a removable roof panel, also a Z06 first, or a convertible. GM puts the Z06 at 77.4 inches wide, against 73.9 for a 2015 Stingray.
• Standard kit. Magnetic Ride Control, an electronic limited-slip differential, Performance Traction Management, launch control, a head-up display, and a carbon-fiber hood with a larger vent, a front splitter and a rear spoiler.
• Z07. The track package, $7,995 in 2015, added Brembo carbon-ceramic rotors, adjustable aero and Michelin Pilot Sport Cup 2 tires. About 31 percent of C7 Z06s have it, by this site’s arithmetic from Corvette Blogger’s production data: nearly 40 percent in 2015, 14 percent by 2019.

GM’s performance figures are for Z07 cars; its 2.95 seconds came from an automatic coupe. Car and Driver got 2.9 seconds from the same combination (one-foot rollout deducted), and MotorTrend, testing on ordinary asphalt, 3.2 seconds from both gearboxes. GM also called the Z06 the fastest production car it had tested on its Milford Road Course, a second quicker than the C6 ZR1.

2015. Shipping began on November 29, 2014, with the convertible following early in 2015. The coupe listed at $78,995 and the convertible at $83,995, destination included. Of the 8,653 built, 51.6 percent were manuals and nearly 40 percent had Z07.

2016. The peak year, with 14,275 built. New were an available front curb-view camera and power-cinching hatch and trunk latches. GM announced 500 C7.R Editions, every one a Z07 3LZ in Corvette Racing Yellow or Black; Corvette Blogger’s production data counts 650, including 150 for export.

2017. In July 2016, chief engineer Tadge Juechter said Z06 production would pause for a few months and return in the fall with a redesigned supercharger lid and more cooling (details in Track overheating). Automatics took 70.9 percent of the 7,273 built.

2018. A short model year: 2,802 built. The Carbon 65 Edition, a $15,000 package, ran to 650 numbered cars, 353 of them Z06 3LZs. The Z06 got two new wheel designs and a gray interior.

2019. A 20-month model year from late January 2018, with 6,937 built. The 2019 owner’s manual lists a “V08 Heavy Duty Cooling System” holding 12.7 quarts of coolant, against 11.8 without. No GM document found says which Z06s have it; owners report a thicker radiator on automatic coupes. Automatics built after March 1, 2019 got GM’s updated transmission fluid at the factory.

Sorted by who said it, the evidence shows a real problem with narrow edges.

What GM documented

GM’s first bulletin on it, PIP5311 (opens in new tab) (August 2015), sets the design target: a manual Z06, driven by a professional on GM’s Milford Road Course on an 86°F (30°C) day, keeps its oil, coolant, transmission and differential fluids below their hot warnings for, in effect, a full tank of fuel. The automatic in Drive holds lower gears and higher rpm, so it laps faster but reaches its limits sooner. For long sessions GM advised the manual, or paddle shifts into higher gears, and a cool-down lap or two after a warning.

The “strong potential” line came with the 2017 model year (PIP5311C, October 2016) and was repeated for 2015–2019 cars in December 2018 (PIP5311D). The 2018 and 2019 owner’s manuals recommend a manual transmission for extended track use at higher temperatures.

Then came the coverage. Special Coverage N202302720 (opens in new tab) (December 2020, revised January 2021) covers 2015–2016 manual and 2015–2018 automatic Z06s that “may overheat and enter a reduced power mode when driven on a track at sustained high speeds in high ambient temperatures.” With evidence such as a trouble code, a video or a track receipt, automatics get a new radiator and revised shift points, manuals an auxiliary radiator. GM counted about 22,221 U.S. cars involved and expected 5 percent, about 1,100 by this site’s arithmetic, to need parts. Coverage runs 7 years or 72,000 miles from the in-service date, so by October 2026 only a car first sold after about October 2019 can still be inside it. GM doesn’t say why the 2017–2019 manuals were left out; the extra cooler in What changed for 2017 is the likely reason.

What changed for 2017

The details come from chief engineer Tadge Juechter, in an October 2016 answer relayed by CorvetteForum’s Ask Tadge producer (opens in new tab); no GM bulletin, manual or release found for this guide describes them. Every 2017 Z06 got substantially revised intercooler geometry. Manual cars also got a “lay down” cooler, the one automatics need for transmission fluid, plumbed in series with the radiator to cut coolant temperature about 18°F, enough, he said, for a pro to run a full tank in up to 100° heat. Automatics improved less, GM was “not claiming full-tank-of-fuel robustness above 85 degrees” for them, and for hard track work in heat he called the manual the best choice. Neither gearbox, he said, has an issue in normal street driving.

What testers measured

On a 70°F day at Willow Springs, MotorTrend’s track retest (opens in new tab) (March 2015) saw oil near 320°F within a few laps and power falling off until a cool-off lap; its automatic test that month says its manual cars did the same. Lap times slipped a few tenths a lap, an effect MotorTrend judged small.

MotorTrend’s 2015 Best Driver’s Car Z06 failed to finish, down on spark timing and making no boost, weeks after the same car ran Car and Driver’s Lightning Lap in 2:44.6 in 100-degree heat. Juechter blamed an unlatched intercooler pump connector and said some owners’ overheating complaints were traced to badly bled intercoolers; GM bulletins 17-NA-408 and 18-NA-088 tie hot-track misfire to air left in that circuit after service.

What the courts did

Matanky v. General Motors, filed in federal court in Michigan in February 2018, gathered suits by 2015–2017 Z06 buyers alleging overheating after less than 15 minutes of track driving and more than 30,000 cars affected. In March 2019 (opens in new tab) the judge struck the nationwide, New York and Ohio class allegations but let warranty, fraud and consumer-protection claims proceed in 16 states, taking the allegations as true, as courts do at that stage. In September 2020 the case was dismissed with prejudice by agreement, with no class certified, no class settlement filed and no finding of a defect. The plaintiffs’ law firm calls it resolved and points to GM’s December 2020 coverage.

What owners and NHTSA report

Owners on three forums describe the same pattern. Z06s can overheat on hot tracks, automatics most often; one 2016 automatic hit 282°F coolant in 4 laps in Las Vegas. Their fixes: bleed the intercooler, paddle-shift at 5,000–5,500 rpm, take the cool-down lap. On the street most report nothing, one owner through 110°F California road trips; the exceptions are a 2017 automatic’s reduced power on a hard run on a hot day and secondhand reports from hot traffic.

NHTSA’s file is nearly silent: of 624 complaints for 2015–2019 Corvettes, all trims, this site found one in which a Z06 owner describes overheating on a track, against about 39 wheel complaints from Z06 owners.

Which one to buy for how you’ll drive

• Street, and the odd cool-morning track day: any year, either gearbox. The heat story isn’t yours; the wheels are.
• Regular summer track days: a 2017–2019 manual. It isn’t immune: MotorTrend’s 2015 manuals faded too, and one 2019 manual owner reports coolant still running hot on track.
• A track car on a budget: a 2015–2016 manual, ideally with the coverage’s auxiliary radiator already in.
• An automatic you’ll track anyway: higher gears, cool-down laps, and the coverage radiator on its record.
• Paperwork for any of them: a Chevrolet dealer’s warranty history for the VIN, showing any N202302720 work; records of any intercooler or supercharger service; and a straight answer about track days.

None of that makes it a car to fear. It makes it a car to buy with the right gearbox and the right receipts.

For a street buyer, the wheels matter more than the heat. NHTSA doesn’t separate the Z06, so this site read the narratives: 72 wheel complaints (opens in new tab) against 2015–2019 Corvettes mention the Z06, about 39 of them from owners who say their own car is one and at least 11 from Grand Sport owners on the same wheels. Roughly 30 describe a slow leak, and roughly 15 point to the inner lip, bead or barrel, the inboard side of the rim. A 2016 had a hairline crack inside the left rear lip at 12,000 miles; a 2017 cracked both rear wheels at 15,000 with no pothole.

In Bossart v. General Motors, filed in April 2020, owners alleged the cast wheels on 2015–2019 Z06s and 2017–2019 Grand Sports were too weak and should have been forged. Those were allegations; the case was dismissed by agreement in September 2023. In 2024 GM announced its Corvette Wheels Limited Reimbursement Program, repaying owners for cracked or bent wheels replaced within 4 years or 48,000 miles if they could show the damage wasn’t from an impact or road hazard. Claims closed on January 25, 2025.

GM bulletin 17-NA-052 says a cracked aluminum wheel is discarded, never welded or straightened: a cracked wheel means a new wheel. Owners in a 2024 CorvetteForum thread choose between OEM-look replicas (one warns they crack too), a tire-and-wheel warranty (one was quoted $750 for five years) and forged wheels.

No recall covers the Z06 alone, or overheating, wheels or the eight-speed. The three 2015 build-window recalls cover cars built before Z06 shipping began; a VIN check settles it. GM’s bulletins fill in the rest.

• Eight-speed shudder. 16-NA-175 lists the Z06 automatic. The final fix, 18-NA-355, is a one-time fluid exchange for LT1 and LT4 automatics built through March 1, 2019; the C7 buyer’s guide has the details.
• Supercharger belt tick. PIP5455C (opens in new tab) (July 2018) traces a tick or flutter at light throttle in four-cylinder mode to the belt tensioner. The fix is a Gates “green” belt, K080852HD (aftermarket, named in GM’s bulletin); a new tensioner alone doesn’t cure it. Owners report tensioners failing too: a dealer charged one more than $450 for a new one in 2019, and another owner did both belts and the tensioner for under $200 in parts.
• 2017 idler. PIP5492: a moan or scrape at idle from the supercharger idler pulley on 2017 LT4s in a VIN range. GM’s fix is idler GM 12668046 (OEM).
• Coolant. 22-NA-047 (2022) covers coolant loss from a leak at a cylinder head bolt boss, sometimes needing a new head. 20-NA-166 (2025) covers a cold-start check-engine light with P050D or P0300 and white smoke, from coolant possibly reaching the cylinders. Both also cover GM trucks.
• Steering. PI1535B adds a steering-gear cooling duct for a “Service Power Steering Gear” message on hot track days, and recalls 19V086000 and 25V175000 replace 2017–2018 steering gears whose assist may fail.
• Windshields. Seven NHTSA complaints for 2015–2016, all trims, describe stress cracks with no impact, four on the inside of the glass. Owners report warranty replacements on new cars; later complainants say GM or the dealer refused once the warranty ran out.

Most of a Z06’s known trouble can be found before money changes hands.

1. That it’s a Z06. The eighth character of the VIN is the engine code, and the LT4’s is 6, per GM’s 2015 owner’s manual.
2. Records. Run the VIN through NHTSA’s recall lookup (opens in new tab), and ask a Chevrolet dealer for its history: recall work, the N202302720 radiator, wheels replaced under warranty.
3. Every wheel, off the car or on a balancer, inner barrels included. Ask whether any tire needs regular air.
4. Cooling. Owners check the coolant expansion tank and the intercooler reservoir for excess air. Scan for stored misfire codes (P0300, P050D), and ask about track use and any reduced-power episodes.
5. Oil. Check the dry sump GM’s way: warm (at least 175°F), engine off, 5 to 10 minutes after shutdown. Cold, it can read empty. Ask for the receipt for the 500-mile break-in oil change.
6. Automatic. A light-throttle cruise to feel for shudder, and the 18-NA-355 receipt unless the car was built after March 1, 2019.
7. Manual. The clutch fluid level, and a pedal that always comes back up (a 2017 owner reported a $4,500 bill for one that stayed down, in 2024).
8. Supercharger. A tick at light throttle (the belt) or, on a 2017, a moan at idle (the idler).
9. Track wear. Tires, pads, alignment, splitter damage, and chips on the rockers and lower doors.
10. Z07 brakes. The pads have no built-in wear indicators, so look at them. Owners judge carbon-ceramic rotors by weight and by the minimum thickness stamped on the rotor.
11. Windshield. A crack on the inside of the glass.
12. A pre-purchase inspection on a lift, by a shop that knows Corvettes. One buyer’s turned up a cracked wheel.

Bring a Trailer closed 61 C7 Z06 auctions from April 1 to September 30, 2026: 53 sold, from $49,750 to $117,000, at a median of $78,500 by this site’s count, and 8 stalled at bids of $47,250–$72,500. Most were low-mile cars: of the 44 sold with mileage in the title, the median was 10,000 miles and only 5 topped 20,000.

Three pedals pay. The 31 sold cars titled “7-Speed” made a median of $85,000; the other 22, automatics or cars whose titles don’t name the gearbox, $71,250. Three C7.R Editions brought $83,666–$94,000, and a 2018 Carbon 65 $75,000.

Hagerty put an excellent (#2) Z06 in the mid-$70,000s in February 2025, 36 percent above a base C7, with automatics worth about 10 percent less. At the high-mile end, the cheapest clean-title Z06 CorvSport found on Autotrader in December 2025 was a 2016 convertible with 119,321 miles and one accident, at $46,800. That’s the performance-per-dollar math: a decade on, 650 supercharged horsepower starts in the high $40,000s.

Fuel. EPA rates the manual at 15 mpg city and 22 highway, and a 2016–2018 automatic at 13 and 23 (13 and 21 for 2015, 14 and 23 for 2019). The 18.6-gallon tank takes premium only: GM calls for 91 octane or higher and warns that lower octane may damage the engine.

Oil. 9.8 quarts with the filter. The 2015 manual calls for dexos1 5W-30 and recommends Mobil 1 for dry-sump engines; for 2019, GM switched the factory fill to 0W-40 dexos2, approved for street and track.

Track prep, per GM’s 2015 manual. 15W-50 synthetic oil, about half a quart above the upper dipstick mark; brake fluid with a dry boiling point above 534°F (279°C); rear axle fluid changed after the first track event and every 24 hours of track use; the A/C off if power drops. GM also wants 1,500 miles on a new LT4 before its first track event, which a 1,400-mile collector car hasn’t covered.

Owner-reported bills. Dated, so get fresh quotes:

The same 2015 owners said street pads last tens of thousands of miles and rotors rarely need replacing on a street car. For a Z06 that sits, see the battery maintainer and car cover guides.

Buy a 2017–2019 manual with records and four inspected wheels. It has the extra cooling Juechter described, the gearbox GM recommends for hot track days, and the strongest prices when it’s time to sell. For the street alone, any well-kept Z06 qualifies: an automatic costs about 10 percent less by Hagerty’s figures, and GM and most owners say it’s fine on the road.

The budget path is a 2015–2016, the cheapest Z06 years at Bring a Trailer medians of $73,000 and $76,500. Make it a manual if you’ll track it.

Walk away from a tire that keeps losing air with no wheel inspection, a tracked automatic with no cooling records, or any Z06 without paperwork.

Get past those and you own 650 supercharged horsepower from America’s sports car, and a low-mile one still sells for about its 2015 sticker. Keep the intercooler bled and the cool-down laps honest, and the rest of the paddock gets a long look at those four exhaust tips. For the Z06s before it, see the C5 Z06 and C6 Z06 guides.