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Karl · 09-09-2022

I am using Mobil 1 Formula M 5w40 with no issues.

The European motor oils appear to have more zinc and phosphorus.

Car runs great and this is used in my 401 cid LT5. I chose this weight combo for all the reasons mentioned above.

09-09-2022	#4
Karl Join Date: May 2013 Location: Chicago Posts: 975	Re: 0W40? I am using Mobil 1 Formula M 5w40 with no issues. The European motor oils appear to have more zinc and phosphorus. Car runs great and this is used in my 401 cid LT5. I chose this weight combo for all the reasons mentioned above. __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold