"Joe" <email@example.com> wrote
>I was thinking either 10W-40 or 20W-50? Any recommendations?
> How about synthetic or conventional?
Unless the engine has a recent rebuild (~10,000 miles) then stick with dino
oil. I only used 20W50 for break in on my 351W stroker last summer in
August. It's too damn thick and even though it's more heat resistant, it
takes FOREVER to get pumped to the top of your motor, causing way more
damage than just using a lighter oil. I drained the 20W50 at 500 miles and
switched to 10W30 for the summer. At 10,000 miles I'll switch to 5W30 Synth.
'66 HCS Mustang 289
'68 Ranchero 500 302
'69 Mustang Sportsroof 351W