As a custom engine re-builder here, 66 years in business where I work: I have seen alot of engines thru here, I try to find out the history of every job thru the shop, ie: why is it here? blown headgasket,hose failure.etc... I ask miles etc, when I notice a high mileage engine (250,000 miles and up) that is extra clean,and no bearing wear,I make a point to ask what oil the customer had used? Many many cases they reply "Valvoline" and "Valvoline synpower" I know you guys hate the high sodium content,but I must admit it does have good results out in the field.The principle purpose of "salt" additives in engine oils is for a "detergent" action...think of it like grains of sand sloshing about and "scrubbing" surfaces and "preventing" carbon detritus deposits from caking up. Gregg