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What engine oil should you not mix together?

Can you mix 0w-40 and 30w oil together and get something like 15w oil? How would that math work? When is it a problem to mix to different types of oil together other than oil weight?
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2answers
237 views

2014 Jeep SRT 6.4L oil filter was too small - what kind of damage?

What possible damage could my engine incur from having an oil filter installed that is smaller than the suggested size? I have damage but I’m interested to hear what this forum has to say about it ...