Oil light on at idle
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 12
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
Not the thrust bearing but the press in bearings the cam rides on. And NO thicker oil will not wear the engine out sooner. The factory booklet that comes with your jeep tells you to run a heavier oil at higher temps. 5w 30 when hot is like running **** in your engine. The thicker oil just squishes out of the slower then the light weight oil.
Ron
Ron
What the manual actually says is that if colder temperatures will be sustained for a time, then 5W-30 is desirable.
This helps get the oil flowing easier and sooner during cold starts. Thereby decreasing wear on the bearings, among other things.
You just don't need anything heavier than 30 weight.
Seasoned Member
Joined: Jun 2011
Posts: 281
Likes: 2
From: Garden Prairie
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
Bobistheoilguy.com. Worth a read. It explains oil weights, how pressure is generated, what modern oils and their formulation do to engines designed by Dino oil guys. Time to stop guessing about your oil.
He's not affiliated with anyone either.
Low oil pressure is a sign of poor tolerances.
Best of luck.
He's not affiliated with anyone either.
Low oil pressure is a sign of poor tolerances.
Best of luck.
CF Veteran
Joined: Nov 2011
Posts: 2,322
Likes: 1
From: Edmonton
Year: 1990
Model: Cherokee
Engine: 4.0
Originally Posted by Firestorm500
No, 30 weight is 30 weight when it warms up.
What the manual actually says is that if colder temperatures will be sustained for a time, then 5W-30 is desirable.
This helps get the oil flowing easier and sooner during cold starts. Thereby decreasing wear on the bearings, among other things.
You just don't need anything heavier than 30 weight.
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