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Unread 06-27-2013, 11:29 AM   #16
Registered User
1993 ZJ 
Join Date: Aug 2010
Location: Austin
Posts: 1,187
I run Rotella 15W40 in my 4.0 all the time. It definitely made it run smoother and quieted down some lifter tap I had. It's pretty warm in Austin so I don't worry about the cold weight being a little thicker. It also stays cleaner longer. I had been using Castrol 10w40 and it would get visibly darker after a month or so. I've been running the same Rotella in there for about six months now and it's still pretty clear.

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Unread 06-27-2013, 12:40 PM   #17
Registered User
1998 ZJ 
Join Date: Apr 2010
Location: Lakeville, MN
Posts: 557
All the Land Rover experts suggest using diesel oil in the old petrol V8s... Me, I suggest selling the rover for a jeep, but you are fine with the oil.

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