In the process of new clutch, oil pan gasket rear main etc. Noticed this wear pattern on all the cam lobes, not sure what to make of it
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Looking at the FSM in order to replace the cam the engine needs to be removed, can the cam be replaced without pulling the motor? This is territory I have no experience in.
There are some threads here on the oil filtering systems of the F vs the 2F. The F has an oil filter of coarse but not all of the pumped oil passes thru the filter, some gets routed direct into the engine unfiltered. The oil does get filtered, it just takes longer and it has to pass thru the engine a few times. If the oil gets contaminated then the cam and all bearings are kind of unprotected for awhile. Very important to do oil/filter changes on time.
This being said, your cam is worn out and it is contaminating your oil.
I had the same exact problem with a worn out cam in my 40's 2F. I dropped the bib, pulled the radiator, valve, side and timing covers and had the cam replaced and everything put back together in under 4 hours. While I was in there I installed new timing gears too. It's very easy to R&R the cam so don't pull your engine unless you plan on rebuilding it.
I run 15w-40 oil intended for diesel engines. It has the additional zinc and other additives intended for high friction engines. Any oil rated specifically for the new style diesels will give you this higher level of protection.