On the subject of motor oil and additives....The heavy additive
package in diesel and Harley Davidson motor oils helps keep your
intake valve stems from galling... When they gall, the clearance
between the stem and guide are increased and the valve won't
seat in the same place every cycle...Result...poor compression when cranking and accellerated valve seat wear.. That's why Chevy started putting brass inserts in their valve guides after
1980.. You can use heavy additives or change parts if you want
an engine that lasts and lasts... You can also use additives..
even 2 stroke oil in the fuel.. I have noticed that using
Shell Rotella 15W40 oil ($14 per gallon retail) improves ring
seal resulting in improved power and fuel economy.. But don't
ever use this stuff in a vehicle that has a CAT.. It will contaminate and plug the CAT in less than 30,000 miles.
Blind Melon
