Ok I have to put in my 2 cents.
I have one question but it may led to more that that.
Has anyone seen a side by side wear test with conventional
oil and
synthetic? In all these years I have yet to see a true engine side by side test. Why is that? Can not be due to cost. How much would it be to hire an independent lab to have two identical engines run side by side? One running say Valvoline 20/50 and one running Mobil or Amsol or what ever in a 20/50. Change the
oil when recommended by the engine builder i. e. Ford,GM or whom ever for the conventional and changing the
oil when Mobil one or Amsol says to. Keep a cost list of oil change cost say up to the equivalent of 100,000 miles. Tear them both down and measure all area's of wear and post the result for all to see. If the
synthetic is all that wonderful seems like I would have seen this years ago. I have had
synthetic sales folks come to my shop to sell me the stuff and have asked everyone of them the same question as yet have never had an answer.
I have had customers that love their Mobil 1 and use it from day one after break in. Have one customer that kept the car for 12 years or more and bingo at around 125,000 she started burning oil. Never did get a chance to tear it down to check it for wear as his son wreaked the car shortly after it started smoking.
Till then I will stick to what I know works over the long haul.
If any of you have seen a test like I am talking about PLEASE tell me were to find it.
Old school what can I tell you.
Oh and just for the record I have never had an engine of mine come back for an oil related failure in over 25 years of building engines using the "old" stuff.