Should i put 10w-30 or 10w-40 in my 4.0? And also should i use rotella or mobil 1? -
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post #1 of 3 Old 08-30-2013, 12:02 AM Thread Starter
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Wj Should i put 10w-30 or 10w-40 in my 4.0? And also should i use rotella or mobil 1?

Should i use 10w-30 or 10w-40 in my 4.0 and also should i use rotella or mobil 1 high mileage oil?

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post #2 of 3 Old 08-30-2013, 05:04 AM
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I have three JGC's ('98, '02 & '04), and I use Pennzoil High Mileage 10w30, with a FRAM xtra-guard filter, changing oil every 6-8K, and have had no oil related issues. I've found Wal-Mart has the best prices for the oil & filter.

2004 Jeep Grand Cherokee Limited 2x4 4.0L
2002 Jeep Grand Cherokee Sport 2x4 4.0L
1998 Jeep Grand Cherokee Laredo 2x4 4.0L
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post #3 of 3 Old 08-30-2013, 09:49 AM
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Rotella is tried and proven as top notch in the 4.0, Mobil hasn't worked out near as well in that engine. This is based on review of countless UOA's (used oil analysis).

All you "need" for the 4.0 is a good 10w30. You can run thicker but you're not gaining anything but it won't hurt anything either, other the mpg by a tiny amount.

Rotella 10w30 is a very thick 30 grade it's nearly a 40 grade anyway and therefore it's a top choice and just about perfect for the 4.0.
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