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Originally Posted By: abycat 5w30 syn all day long! That engine was not back spec'd for 5w20. The gearing most likely will make the engine scream at highway speed so a xw30 would work great in my opinion. Could putting a synthetic oil in an older engine cause damage to some of the gaskets and...

Originally Posted By: CT8 What will be the temperatures that you will be starting the engine? 15W-40 would be fine to about 15*f. I live in western Washington, the motor will not be used all that often in the winter, our average winter temp is around 40 degrees, it will mostly be ran during the...

Hi all, new here, just picked up a motorhome with a 1987 carbureted ford 460 in it with 45,500 miles on it and I'm getting ready to do my first oil change. All the parts stores here tell me 5w-30 or 10w-30 is recommended, but being this is an older motor that I'm sure has had some severe duty on...