10w 40
#6
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
0w40, 5W40, 10w40, 15W40 and straight 40 are the same vis at operating temp. There's not a huge difference in operating temp, summer or winter, in a water cooled motor. The lower the 1st number, the quicker the flow at any temp below operating temp.
#7
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Location: Fauquier County, Virginia
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Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
Edit: Just a note here. I am totally agreeing that 0w and 5w are best because they do flow faster when the engine is cold. I will not argue against this because it would ignorant to do so.
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#8
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
The way I look at it is, oil needs to flow as quick as possible to the valve train, as the valve train is the furthest point from the oil pump....but the valve train needs lubrication asap. If a little oil gets past worn valve stem seals, u just get a little extra momentary upper cylinder lube and maybe a little puff of smoke at start-up. Dry seals wear more/quicker than wet/lubed seals.
#10
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
A 4.0L will be happy as long as there IS oil in the pan. Ive tried 10w30 and 10w40 and seen no difference with a 215K+ motor. So i run 10w30 in the summer, 5w30 in the winter
#12
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Year: 1988
Model: Cherokee
Engine: 4.0L
10w40 is the only oil my xj actually likes, the valvetrain is quiet and no leaks. When I use 5w30 I'll lose about 1qt a month on floor.
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