1990 300zx: Chevron Supreme 10w30 (starting autorx rinse)
1968 Chevy flatbed PU: Kendall 10w40
1986 Toyota Cressida SW: 5w30 Castrol GTX
I've been using K&N oil filters for the past year or so. Expensive, but the napa gold spec for the Z changed right around then and I'd rather not use a filter that has the same part number but the gasket isn't where it used to be.
IDK the Napa part number, but it's definitely not a Wix product anymore. The K&N is much closer to the old spec/Wix
and overbuilt to say the least.