Oct 252012
 

I just bought a used GMC Envoy it has the 4200 engine and has 78000 miles, is it ok to start using synthetic oil or will this do any damage?

  2 Responses to “05 GMC Envoy”

  1. Absolutely OK to start using Synthetic oil. The synthetic oil will provide better protection at start up which is when most damage is done to piston rings. Much better way to go and will prolong the life of the engine.

    Will not cause any harm by switching to synthetic oil.

  2. I assume that you have the owner’s manual which will show the proper SAE’s that you would match with any quality synthetics lubricant you choose. The engine’s oil cap or dip stick may also it; follow this. Don’t expect synthetic to solve any problems that are part of the engine’s history.

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