[Chris 2018 ZL1 A10]

Fellas,

This has been a great thread with many knowledgeable guys weighing in on it. I’ve learned a lot about the subject as well as some unpleasant scenarios from broken and overpriced bolts to some very poor after-sales support. The following is posted out of my own ignorance on the subject and that no one else seems to have brought up the durability of synthetic oil in a DI engine.


It seems that the biggest reason FOR a CC is to avoid having oil entering the induction system and fouling intake valves over time. Considering the advanced properties of the synthetic lubricants we use, is it reasonable then to expect that coking, gunk or sludge are not going to happen? It’s one thing to find some oil under the cover, it’s another to find valves that have actually been contaminated to the point where performance has been degraded. Has anyone with an LT4 without a CC experienced performance degradation due to contaminated intake valves? Also, would not a small amount of oil going through the top-end of the motor actually be a good thing?

TIA
Chris