What is your question?
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What is your question?
I have 112,000 on my van and want to know if I will create any problems if I switch to a synthetic oil.
1 Reply
It should not cause any problems to switch your 2003 GMC Safari to synthetic oil. There are some synthetics specially designed for high mileage engines, I would choose one of those. The only item of note would be increased oil consumption. If that turns out the be the case you could always switch back to conventional oil.