synthetic or standard oil

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08-31-2011, 11:22 AM

Btommy

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Year: 2001

Model: Cherokee

Engine: 4.0

synthetic or standard oil

2001 145k miles what is going to be the better oil for me?

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08-31-2011, 12:25 PM

duffman5001

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Year: 88

Model: Cherokee

Engine: 4.0

This topic has been discussed many times here, and there are many different opinions so I would suggest searching it...

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08-31-2011, 03:03 PM

mrfajita

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Year: 1996

Model: Cherokee

Engine: 4.0L HO

I would use standard in any 4.0. My buddy got his Jeep and it had synthetic in it. Had about 40 oil leaks and oil pressure very rarely above 30. Put in some good conventional 10-30 and it leaks way less (hardly at all for 175k) and pressure never goes below 30.