Best engine oil to use in a 4.0?
Getting ready to change my oil, and heard these straight 6's don't like synthetic oil, causes them to leak. Don't want to mess anything up, so I thought I would ask, for a Texas Jeep, what is a good oil to put into a TJ with 112K on it?
Originally Posted by JimE2 View Post
10w30 Quaker State High Mileage here. I know guys that have had this motor for years, and only bought what was on sale, never had a problem. Know guys that use Mobil 1 and have all kids of problems. Then again, I also know the complete opposite of what I just posted. So, to each their own. Each Jeep is completely different.
I have used Mobil 1 in every vehicle I've ever owned with great results. I would also suggest amsoil and royal purple as well, but those are expensive and not really worth it for engine oil IMO. I change my oil every 5-6k miles
Valvoline 10w30 is what I look for...
'06 TJ Rubi (Light Metalic Khaki) 6sp, Bought 3-10 w/6500 miles. 31 MTR's, UCF alum UHC T-case & engine skid w/ LoPro, Rokmen gas tank & steer gear skid, Ridler dif covers F/R, Warn 8274-50, Optima Yellow top, Pro Comp front 3/4" spacers, Currie 1" BL, Bomb Proof MML, Novak cable shifter, AGR Super Box 2, Warn rear bumper/tire carrier, Rubi locker mod/pumps moved to engine bay, OBA. Build to come...
Does it do any harm switching back to regular [new] oil, from, say unknown or possibly synthetic oil? I really have no idea what is in it right now, and want to switch to a known good oil of proper weight for Texas.
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