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I leave mine off so that:
- It's easier on the valve cover, wiring harnesses, and other plastic components that sit under the cover. The engine covers are not just plastic but also have very thick insulation.
- Allows for easier inspection of leaks or weeping
The S55 has a tiny useless engine cover and the M cars don't run underhood heat shielding either. I did the same with my M235.
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