Oil weight

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04-12-2012, 09:27 PM

stang23456

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Join Date: Mar 2012

Location: Port Orange,FL

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Year: 1999

Model: Cherokee

Engine: 4.0

Oil weight

Is it ok to run 15w40 in my 99 Cherokee with 140k miles ?

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04-12-2012, 09:29 PM

salad

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Location: Parham, ON

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Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Yes, especially as you are in Florida. There are about 4000 threads on this. For specifics search "Rotella"

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04-12-2012, 10:18 PM

Bustedback

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Year: 1995

Model: Grand Cherokee

Engine: 4.0 with all of the noise and clatter

The Rotella has more zinc in it ans better for our flat tappet cams. I would not go any heavier than 15w40.

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