Oil for my 71 440

[commando1]

 

[cantflip]

(Raises hand)

I have.... but it was 50's vintage Mopar flatheads that spent most of their life with non-detergent oil.
And before anyone says "no valve cover"... (not mine) the covers are on the side.

Ok... no rockers...

 

[Turboomni]

I find it hard to understand why Valvoline would sorta debunk the zinc thing and yet offer it for sale.

 

[300rag]

I've been using this stuff I buy at Wallyworld

10W30 Quaker State Defy High Mileage, API SL semi-synthetic

zinc = 1221 ppm
phos = 955 ppm
moly = 99 ppm