Guys/Gals: My engine builder swears that this is the only oil to use in my newly rebuilt slant six in my 1974 Duster. Completely stock rebuild, not racing or turbo - ing it. Has anyone used this stuff. Pricy at $10.00 per quart. What oil do you use in your stock slanty? I've heard that off the shelf NAPA store brand oil is perfectly okay in these motors.
On a new flat tappet cam engine, I'd keep the zinc levels at least 1200 ppm. That's good oil that he recommended, especially on a new engine. My slant with over 100k miles gets just rotella T4 from walmart.