Should i put 10w-30 or 10w-40 in my 4.0? And also should i use rotella or mobil 1? - JeepForum.com
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Unread 08-30-2013, 12:02 AM   #1
Grndcherokeewj
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Join Date: Aug 2013
Location: St clair shores, Michigan
Posts: 72
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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Unread 08-30-2013, 05:04 AM   #2
specia1k
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Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 323
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.
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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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Unread 08-30-2013, 09:49 AM   #3
KayCeeJeep
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Join Date: Apr 2011
Location: Kansas City, Missouri
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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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