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Has anyone ever seen a long-term test of the effect of synthetics vs. convetional oil? While it would be hard to get two engines exposed to the exact same real-world usage, what about any kind of labarotory test under controlled ciscumstances simulating, say, 100,000 or 200,000 miles of driving...

What is it about the design/manufacture of the VW engine that permits a factory-recommended 10,000 mile OCI?

It was 1978.... "Never wax your car again!" Man , that stuff sucked dirt out of the air and fused it to my car.

In your overall opinion, durability aside, what wax/polish/sealant produces the very best shine?

I used Meguiar's for 25 years and swithced to Zaino for 3 years. The price was killing me so I tried the Meguiar's TechWax 2.0 and Ultimate Detailer - work just as well as far as I can tell and waaaayyy less money.

Ok, after much reading on BITOG and some of my own research, here's the OCI program I am on: 2003 Chrysler PT Cruiser non-turbo - Pennzoil Platinum 10W-30 w/ an Amsoil Ea filter. about 6,000 miles per year - so this will be an ANNUAL oil change. 2004 Ford Expedition 5.4 liter - Pennzoil...