WTF ? This goes against all we were taught

[badgett]

Check this out .....

MYTH: Light oil such as 5W-30 delivers the best mileage. Utter nonsense. Five decades of road testing and engine dyno testing for efficiency has shown that straight 40 or 20W-50 or 15W-40 delivers the best mileage for your car or truck.

HINT: Drain your light oil and switch to a heavier oil because that will reduce friction in the engine and give it better efficiency and wear protection. We use Torco Oil for best mileage. Torco International is found in Santa Fe Springs, California.

MYTH: Thick oil has too much friction. 35-percent better mileage can be attained in some cases with a thicker oil. But use a good oil, not some cheap brand. The little you save in the cost of oil comes back to haunt you with rapid wear and poor mileage.

HINT: Engines.love a thicker oil because it has less friction and wear. Find oils with SF, SG and SH specifications. Avoid SJ and SL oil ratings. Start using motorcycle oils instead of automotive oil. It is quite easy to demonstrate the fact of thick versus thin. I first did it in 1967. I used to add a few oz. of bright stock to engine oils to reduce friction for better power and mileage.