Jpierro79
Senior Member
- First Name
- John
- Joined
- Mar 6, 2019
- Threads
- 33
- Messages
- 398
- Reaction score
- 273
- Location
- Myrtle beach South Carolina
- Vehicle(s)
- 2018 type R 2015 c300
Untrue after 21 years as an automotIive tech I have had to replace many plastic components due to warpage. Valve covers included. The gaskets are design to compress on a fine line not like old cork gaskets. Any warpage can break that seal that is literally maybe 2mm wide compressed at the most. The other issue is in gasket design not enough material to compress sufficiently. Plastic parts run in problems acrossed platforms. Anything from Buick 3.8 plastic intake manifold leaking coolant into the intake to pressurized coolant reservoirs on Mercedes. Some cars sub 40k all needing replacement. if a specific plastic is more common than you think. It’s not a new problem. The plastic oil pans on mk7 gti have issues. Another reason can be from a bad off valve. It’s supposed to close under boost to prevent excessive pressurizing of crank case. When it fails the first place to push oil out it the weekest seal. Most often the valve cover. Cars leaking at very low miles is more from warped plastic parts than seals. I’ve tried just seals in those scenarios and few thousand miles later it leaks again. 50k and seeing valve cover leak that goes all the way down the back of the engine i really doubt a seal will solve it with a full plastic cover.
just as an example my wife’s Mercedes C300 needed a whole knew reservoir at 35k cause even with a new cap it couldn’t hold pressure cause the canister was warped where the o ring sat. At 35k it was out of round. I had a brand new Chevy sonic years ago I owned had a warped thermostat housing at 500 miles and was leaking coolant on to the trans and ground.When you find many individuals having the same problem it’s absolutely manufacturing issue overlooked. They won’t test everything it would cost to damn much.
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