I say this is nothing more then a group of people setting off a "Red Scare."
Come open up my engine with high mileage Valvoline Synthetic Blend. Your will find the cleanest engine with very minimal wear for 150K miles. My camshaft looks brand new so do the piston heads and cylinder walls. I guess the PO could have totally rebuilt the engine, but I really doubt it.
TOO much scare about oil. Use a reputable name and a reasonable and recommended weight and you will be fine with the oil.
150K original miles and a VERY strong running car is good, right?
