<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by z_drago:<BR><B><BR>I believe Slick 50 is not a gimmick. At least it isn't a gimmick to the extent that Teflon is not a gimmick.<P>I've seen the dramatic positive effect that using teflon to coat parts with metal surfaces that rub each other (like in an engine or gear box) can have on the longevity of those parts myself - in industrial applications as well as in auto engines. In fact it was after I saw it in industry that I became convinced and started using it in my car.<P>I used the traditional Slick 50 with teflon in an old Acura, and I'm satisfied that it's part of what helped it get to nearly the quarter million mile mark.<P>I used it as part of an oil change every 40-50,000 miles, and then added a little bit (just a little) with every change in between also to freshen the presence of clean teflon in the engine.<P>In short, using a teflon additive like Slick 50 certainly is no substitute for following proper oil change procedures, but for the extra $50.00 or so you'll spend every 100,000 miles on the teflon protection, it's certainly worth it to me. It would be especially beneficial if used from the time the car is new. And it cerainly will not hurt the engine when used properly - one bottle substituted for a quart of oil during an oil change every 40-50,000 miles.<P>I know the teflon works, and $50.00 is hardly a waste, or a burden. You'll spend more than that on toothpaste before you've gone 100,000 miles. And if you can afford the $35,000 car, $50.00 every 100,000 miles will be less than an afterthought.<P></B><HR></BLOCKQUOTE><P>Thanks for your input, the thing that bothers me is that Volvo indicated in the manual that it does not recommend oil additives and yet some other engine manufacturers claim that slick 50 damages the engine. But do you think they are right?<P>