My first vehicle! 1956 CJ5

[bmorgil]

Thanks 56', I enjoy your project! Zinc is required in your engine. I would run a conventional 30 weight or a 10W-30 engine oil that contains Zinc, rather than add it. Zinc has its own issues. Too much Zinc is not a good thing in an engine either.

I would not use a Non-Detergent oil. I would stick to an oil that has a Zinc additive, and meets the spec of at least SF. You don't want the high detergent of a diesel oil, but you do need some to keep the build up off the rings. A lot of guys use a combination oil like Rottela. Just remember an oil with high detergent doesn't perform well at high RPM's. It has a tendency to foam and this will ruin the bearings. Rotella combination oil has a formulation that helps with this. High RPM's is something you wont need to worry about anyway!

Here is a cheap oil that you can get at Wall Mart sometimes or Amazon. I haven't used it but I do know persons who have. It seems to meet all the requirements as well as low cost.

https://www.amazon.com/ACCEL-22500-S...ews/B0052KY6TE