Originally Posted by Imp4
Yeah, those Jeep engineers sure don't know much....
Which is why the original specification was for 5W-30. Once the bean counters and CAFE got involved, it was dropped to a 20 grade.
That said, a 20 will probably be fine… But in the high temperature desert environment at low speed for hours on end, you could get some increasing oil temperatures which is where the 5W-30 will help.
Yeah, those Jeep engineers sure don't know much....
Which is why the original specification was for 5W-30. Once the bean counters and CAFE got involved, it was dropped to a 20 grade.
That said, a 20 will probably be fine… But in the high temperature desert environment at low speed for hours on end, you could get some increasing oil temperatures which is where the 5W-30 will help.