Originally Posted By: lawnguy
A small 4cyl truck with 240k miles, pulling 2,000 lbs in stop and go traffic.
Originally Posted By: OVERKILL
Originally Posted By: lawnguy
Something that prevents metal to metal friction under a heavy load?
Originally Posted By: lawnguy
Is there at least one engine oil additive that isn't snake oil ?
That is one of the functions oil is formulated to do....
What exact scenario are you concerned about here? If you are running a high lift, fast ramp cam in a flat tappet application, there are a myriad of oils formulated for that purpose including M1 15w-50 and the HDEO's (diesel oils).
Then you'd be fine with whatever was spec'd from the factory for it, probably a basic 5w-30.