I have not noticed the performance issues mentioned but am upset that the dealer said that oil changes in the future will be much more expensive because of the 40wt oil. GM should address this with their customers.
I had my vehicle tested and they said they were going to change the oil to 40wt. and put on a new oil cap. They also said I would have an extended warranty. The issue that I'm unhappy with is that they said the 40wt oil would be quite a bit more expensive and it would be at my cost. Has...
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