for the 1100th time what oil do you use?

[Firebirdjones]

No studies that directly relate to that that I'm aware of, but you can send your used oil in for testing and it will tell you exactly how your engine is wearing and whether the oil you use is working for you. The kit is free and I think the cost of the test is $25. Money well spent if you care about your engine.

Here is a cheat sheet to tell you whats going on inside when you get your test back.....

Aluminum : Pistons, bearings, cases (heads & blocks).
Chromium: Rings, a trace element in steel.
Iron : Cylinders, rotating shafts, the valve train, and any steel part sharing the oil.
Copper: Brass or bronze parts, copper bushings, bearings, oil coolers, also an additive in some gasoline engine oils.
Lead: Bearings.
Tin: Bearings, bronze parts, piston coatings.
Molybdenum : Anti-wear additive, coating on some new rings
(washes off as break-in occurs).
Nickel: Trace element in steel.
Manganese : Trace element, additive in gasoline.
Silver: Trace element.
Titanium: Trace element.
Potassium : Antifreeze inhibitor, additive in some oil types.
Boron: Detergent/dispersant additive, antifreeze inhibitors.
Silicon : Airborne dirt, sealers, gaskets, antifreeze inhibitors.
Sodium: Antifreeze inhibitors, additive in some gasoline engine oils.
Calcium : Detergent/dispersant additive.
Magnesium: Detergent/dispersant additive.
Phosphorus: Anti-wear additive.
Zinc: Anti-wear additive.
Barium : Detergent/dispersant additive