5w30 max on 5.4L, or you eat cam phazers and main bearings...
In Response To: Hells Mechanic... ()

I suppose a 40 weight would be a hair over the line in colder climates, especially for a high mileage newer high tolerance engines.

On the 5.4L engines it is more a matter of keeping the oil clean through frequent changes than the grade of the oil. Too thick and you get more damage when sludge mucks up the journals, if you use a thicker oil you should change it more often to assure the smaller tolerances don't bite you in the ass.



Messages In This Thread