What you have to keep in mind is MB allows for 2deg of wear out of the factory. So the question would be is 2deg normal or is it better to bring it back to zero deg?

I don't know if I would worry so much about 4 deg. Just change your oil at the proper interval and keep an eye on it.

Also, keep in mind you should also be checking the condition of your rails, tensioner and slide.

Danny

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