Oil weight

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Apr 12, 2012 | 09:27 PM

stang23456

Thread Starter

Member

Joined: Mar 2012

Posts: 166

Likes: 0

From: Port Orange,FL

Year: 1999

Model: Cherokee

Engine: 4.0

Oil weight

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

Apr 12, 2012 | 09:29 PM

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

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"

Apr 12, 2012 | 10:18 PM

Bustedback

CF Veteran

Joined: Feb 2010

Posts: 12,367

Likes: 23

From: Oroville, CA

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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