I have been using Mobil 1 conventional with Napa oil filters (you're welcome, Jeff). I was thinking about switching to synthetic next change. I have always run it in my other cars without issues.
Does anyone else run synthetic in their 4.0?
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2001 Cherokee Sport -- 40k --
4x4 -- 4.0 HO -- AW4 --
D30 -- 8.25 -- OME 930 coils -- Rusty's full length 2" AAL -- Sensatracs -- 30x9.5 on Jeep Grizzlys -- Homebrew Safari Rack
I change my oil & filter EVERY 2000 miles. I see absolutely NO reason for me to spend the extra money on synthetic oil. Castrol 10/30 in the winter, and Castrol 10/40 in the summer. Oh, and a NAPA Gold filter.
Won't use that Valvoline swill in ANY of my vehicles, and I wouldn't put Quaker State in my lawnmower.