I recently switched from Castrol 20W50 to Valvoline racing VR1 20W50 because it has more zinc/zddp or whatever - good for old engines. But always liked Castrol for years. I have a spin on adapter so I use a Royal Purple filter.
Walmart 20/50 for me.
12 bucks for 5 quarts.
You will need 1 big bottle because you don't need to change the filter.
Drive for a week and replace with royal purple and a new filter.
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