- The new 6.7-liter V8 has a leak between the oil cooler adapter and the oil pan.
- Dealership technicians have been instructed to replace a pair of oil cooler adapter seals.
- Chevy has already built more than 7,000 Corvettes with the 6.7-liter V8.
It’s only been seven months since Chevrolet unveiled its new 6.7-liter LS6 V8 in the 2027 Corvette Stingray, Grand Sport, and Grand Sport X, and already, an issue with the engine has been identified. Fortunately for Chevy, it hasn’t needed to issue a safety recall, instead only announcing a service bulletin for impacted models.
This service bulletin, issued to Chevrolet dealerships in North America last month, reveals that there could be a small engine oil leak between the oil cooler adapter and the oil pan. Although oil hasn’t been observed gushing out of this area, GM says some bubbling may be visible in the area of the leak when the engine is running.
Read: Chevy Is Still Building 6.2-Liter Corvettes Alongside 2027 Model
For the most part, minor oil leaks aren’t a huge cause for concern, but you don’t expect to see one in a brand-new car. To resolve this leak, technicians are being instructed to replace a pair of oil cooler adapter seals.
The service bulletin notes that the oil cooler and oil cooler adapter don’t need to be separated to make the fix, but says mechanics must run the oil cooler adapter bolts down evenly and tighten them in sequence to avoid any leaks when performing the repair. Initially, each bolt needs to be tightened to 44 pound-inch (5 Nm) before then being tightened to 11 pound-feet (15 Nm) on the final pass.
How Many 2027 Corvettes Have Been Built?
Chevrolet started producing the 2027 Corvette earlier this year, and it’s already built plenty of them. According to Corvette Blogger, the Bowling Green assembly site had produced 3,691 new Stingrays with the 6.7-liter V8 as of the end of September, alongside 1,293 Z06s, 3,204 Grand Sports, and 285 Grand Sport X models. In addition, 380 ZR1s and 269 ZR1Xs have been built for the 2027 model year.
In the new Stingray, Grand Sport, and Grand Sport X, Chevy’s LS6 V8 delivers 535 horsepower and 520 pound-feet (705 Nm) of torque. By comparison, the old 6.2-liter V8 was capped at 495 hp with the optional performance exhaust and had 465 lb-ft (630 Nm) of torque.
