MustangForums.com - View Single Post

1971mach1 · 07-01-2009, 03:17 PM

I notice another group of folks in this thread that don't appear to know about the ZDDP issue of modern oil. None of the oils mentioned here except Valvoline VR-1 has enough ZDDP for older flat tappet engines (yes the old 6 cyls have flat tappets too). Receintly (~4 years ago) the EPA mandated that motor oils be limited to 800ppm ZDDP to be compatible with catalitic converters. The only oils that are still good for our cars are racing oils (like VR-1 and Roush Oil) and some oils ment for deisel engines, motorcycles or break-in oil. The only Mobil 1 that has enough ZDDP is 15W-50.
My tappets were very noisy at cold start with that thick oil (15W-50). It seems to like VR-1 10W-30 but that weight oil needs to be special ordered from Napa, nobody local stocks it..

07-01-2009, 03:17 PM	#7
1971mach1 2nd Gear Member Join Date: Sep 2008 Vehicle: 1971 Mach1 351c Tremec TKO 5-speed- yea! Location: The garage (near SF bay- Calif) Posts: 254	I notice another group of folks in this thread that don't appear to know about the ZDDP issue of modern oil. None of the oils mentioned here except Valvoline VR-1 has enough ZDDP for older flat tappet engines (yes the old 6 cyls have flat tappets too). Receintly (~4 years ago) the EPA mandated that motor oils be limited to 800ppm ZDDP to be compatible with catalitic converters. The only oils that are still good for our cars are racing oils (like VR-1 and Roush Oil) and some oils ment for deisel engines, motorcycles or break-in oil. The only Mobil 1 that has enough ZDDP is 15W-50. My tappets were very noisy at cold start with that thick oil (15W-50). It seems to like VR-1 10W-30 but that weight oil needs to be special ordered from Napa, nobody local stocks it.. Last edited by 1971mach1; 07-01-2009 at 03:27 PM.