Gentlemen: What motor oil do you use?
I live in a warm part of northern California. I use delo 15/40 sn/ck oil and a wix 51460 filter.
Filter is slightly narrower and taller then a standard filter and had an internal standpipe as mine is missing. Makes for instant oil pressure at startup and it's easy to install on my 64 dart.
I change it every 3k.
We have a 84 diesel rover that has done 650,000+ miles on one engine rebuild, uses the same oil.
Edit :. Get ready for a TON of strong opinions !