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Mar 12, 2004
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SoCal
Got an '04 Jeep with a 3.7l gas engine. I just drained the factory oil and changed to Mobil 1 5W30 Newer Car Formula. After reading some old posts I think the 10W30 might be better. Am I correct or is this too thick of an oil? The manual says 5W30 prefered. Any help would be appreciated.
 
Well in So. Cal the 10W-30 would be a slightly better choice if you are going to extend drain intervals. Otherwise-not much of a difference.
 
I have an '02 Jeep with the 3.7l gas engine. Got it used and have taken it from about 13k miles to 30k +. I have used Mobil 1 10W30, Rotella Syn 5W40, and the last 3 changes Schaeffer Blend 10W30.

I say go with the heavier weight.
 
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