If they are not turbos, remove the plastic screen from the flame trap and toss it in the garbage. Switch to synthetic oil. Pick a car to drive, then drive it for at least 30-45 minutes to get the engine oil hot before you park it again.
If you have a turbo, look for PTC cleaning.
Part of the PVC R&R involves the hoses which get old and crack, allowing air into the vacuum system. Lack of vacuum will change the engine performance. A plugged vacuum line, PTC, or engine block passage will cause seals to pop very fast.
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Keeping it running is better than buying new
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