Good move Drover...i too changed my Jeeps diet to Nulon 5w 40 soon as I got it, it is good stuff. I liked it for the very low sulphur content, and had used Nulon in the Hemi prior.
I later changed to Nulon 10w 40...purely for the higher TBN, but have now switched to Penrite Enviro 10w 40 that also meets CJ4 spec that has a higher TBN again.
Pretty happy currently with the Penrite though it is dearer than the Nulon.
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CJ5, CJ7, XJ Sport, WJ HO V8 Overland, WH Hemi V8 Overland, 14 WK2 CRD Laredo-RIP, 15 WK2 CRD Laredo
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