Re: Correct Oil?
Mobil 1 - 15w50 has much more zinc additive for flat tappet motors. Zinc level is 1300, Phosphorus 1200. This is the only Mobil 1 synthetic oil designed for older motors that need zinc. It specifically says for "flat tappet motors". I have used it in my Chevelle and old Flat Tappet Land Cruiser for years. You can get it at Walmart for a good price for 5 quart jug.
Note: I live in a hot climate, so, 15w50 is a fine weight oil for me.
1970 Chevelle SS396 (408), Fathom Blue,
Original Block & Forged Crank, KB Pistons, Edelbrock 6045 Heads,Comp Cam 292H, March Serpentine, RPM AirGap,750HP,100hp Nitrous
A/F Wideband,Tremec TKO 600, 12 bolt,
30 spline Moser Axles, Richmond 3:73's, Hotchkis control arms, swaybars, springs, Wilwood 12" rotors D/S, 4 piston calipers