i know it is a good oil for older engines running flat tappet cams and has a higher concentration of zddp in the oil anything wrong with running it in the 3.7's? i thinkn 10w30 is the lighteset but i need to double check

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2003 Renegade 4X4
3.7l
roof lightbar
front brush guard
everthing else is stock for now

I'm running the Shell Rotella Synthetic 5-W40. No complaints here. I've run it in my trucks for years. It is about $15/gal at Wal-Mart.

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05 Liberty Rocky Mtn.
02 Renny...Traded for 2010 F150, 8200 GVWR, Plow prep, Max tow
1983 Husq. Model 61, modded
Husq 335 XPT, trail saw, modded

I use the 5w 40 synthetic in my diesel and in my Suzuki (SV650) No problems here.

Sorry JJ, but I have been running Rotella T 15w40 in everything I owned since around 1990. Diesels and gas. When I ran diesels I had the oil tested every 30K or so, and found I could stretch the oil change intervals to 5K instead og the ordinary 3K.

Al

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One Ruby, One Grand Cherokee, One YJ, One disassembled CJ, one Chevy Mason dump, one hotrod IH Pick-up, couple of antique tractors.
Former owner of a 5.5 inch lifted KJ

No need to apologise, No bother to me, I'm enjoying my 15,000 mile or one year change intervals.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal