"OK here I go... I used regula
"OK here I go... I used regular 10W-30 in my boat (1987 Regal Sebring w/170) because the oil gets changed so often that it is not a matter of viscosity break down that I am concerned with, I have a 1995 Ford Bronco 5.0L 4X4 that I have used Mobil-1 synthetic 10W-40 in since day one because this is one of my work trucks and is used for pulling my boat. I also have a 1992 Chevrolet Astro cargo van that I use high mileage semi-synthetic 10W-40 because this is my everyday work vehicle. I also have a 2001 Honda CRV that I also used Mobil-1 synthetic 10W-30 in. Here's my logic... Synthetic oil is beneficial in a automobile that has had synthetic oil changes since day one, 0 mileage up to approximatly 35,000 miles. If you start a vehicle on synthetic oil change diet to high in its mileage it CAN cause oil burning issues due to longer viscosity break down and the fact that it tends to be a thin oil when cold and only get thinner when hot. You can get leak-by at the valve stem seals and/or blow by at the rings. Traditional oil tends to be thinker therefore does not "sneak" its way into normal variance locations of an engine. Synthentic oil can also start otherwise none exhistant oil leaks in gasket mated surfaces due to it thinning properties. Here's the breakdown.. Synthetic Oil is good for new to low mileage vehicles while Traditional Oil is better for older or high mileage vehicles.
Now for my creditals to back up what I have stated.. I have been a Master Automotive Technician for over 14 years and have specialized in engine rebuiding at a local Ford dealership for the past 10 years. I have first hand experience dismantling hundreds of engines and rebuilding them. I can tell within 5 minutes of an engine teardown whether has had Traditional vs. Synthetic oil used. Traditional oil DOES gum up and froth inside an engine. Sythetic does not and these engine dismantle easier... cams slip right out, pistons can be pushed out by hand, push rods don't stick to rocker arms or lifters. I hope this helps in this long winded topic for all. Do as you wish, beleive what you may... if it makes you happy, thats all that matters.
Jay
P.S. Ford has been using semi-sythentic oil in the Explorer since 2001 and has been using semi-synthentic in the rest of the vehicles since 2005. General Motors is also doing something similar."
