- Buick Ownership
New to forum. I have a Encore that at 8,000 miles is now in the shop for a cracked no 1 piston. I have read these engines have had this problem. The car was previous diagnosed with PIP5418 service bulletin on Turbo waste gate issue and spark knock. Dealer says these issues are not related. The side of the piston was sheared off. Anyone else having this issue?