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5w-20 / 5w-30 / Synthetic
I've got two questions regarding engine oil
First, the car manual says to use 5W-20 engine oil, what difference does it make if I using 5W-30 instead?
Secondly, is it true that if you start using synthetic motor oil, you can't switch back to regular?
Last edited by x-fangs; 10-24-2002 at 01:07 AM.
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