Teflon additives work just exactly as advertized. They do reduce friction, make starting easier, and increase milage.

They also cost about $2 a quart if added to oil, and they won't stick permanently to the metal, so they go out with the oil when you change it. If people won't pay the extra for synthetic oil, no oil company is going to add $2 to the price of regular oil by adding teflon.

It won't hurt a thing, but it is very expensive for what it does.

I use synthetics instead, am very happy.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!