Running synthetic oil will not void any warantees. The only way that they can void your warentee is if they can prove the oil is bad.

Not true. You risk voiding your warranty if you run an incorrect oil, like 20-50 if 5-30 is specified, or an SC oil when an SG is specified. You do not have any warranty issues using a synthetic oil.

I also have to disagree with this... considering every single 'vette that roles off the line comes w/ Mobile-1 in the engine. I believe this is true of many euro-sports cars as well.

I run amsoil. I'm a dealer, so it makes the decision easy.

I run 10-W40 Valvoline in the engine- can't seem to justify the cost of Synth motor oil when I'm gonna change it ever 2500 miles anyway.

I finally switched over to synthetic's for the gear boxes. I have always had heat problems in the summer months w/ my dual t'case setup. Going to Valvoline Synth 90-W140 made a very noticable change in temps. I also run synth in the rear diff- spinning 5.29's down the hwy generates a lot of heat too.....

I think Darin's point was, running synths prevents the rings etc. from breaking in correctly precisely because its TOO good at lubricating. Those vehicles that ship with synth are machined to do so. For the rest of us, gotta have a little peen hardening and high point removal to not burn oil.

Many motor rebuilds have come back to shops with oil consumption problems and less than optimal performance precisely because the owner used synthetic before the motor was fully broken in.

just checked with the re-maunufacturer (Densmore Motor 1-800-743-7775), and they recommend regular oil for the 1st thousand miles, then you can switch to the synthetics if you wish, and it does not affect the warranty at all. I think the point of running it in to make sure everything seats well is the point which Darin was making, and I can see his point (now).

Thanks again for all the input. <img src="/forums/images/graemlins/cheers.gif" alt="" />

Thanks for the support Bill, The reason for my statement was in the last year I watched Tim over at well...lets just say a well known toyota engine rebuilder, deny two claims due to the owners firing up their engines loaded with synthetic oils. Regardless though....having to wait for rings to seal is an inconvenience but the real danger with synthetics at break-in is the rings not sealing at all due to glazing. We're talking Toyota here...nothing close to what takes place in a corvette engine at initial firing.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />

Thats the best thing you could have done is to call the re-manufacturer, afterall its their warranty and who you would have to deal with in the event of a problem. Good call on your part Germ.

~D

That is correct Bill, they share the same type of fluid anyway (Dextron II ATF). I'm not sure if there is actually any sharing of fluids . <img src="/forums/images/graemlins/kewl.gif" alt="" /> Thanks for clearing that up though, yes that's just for the automatic tranny transfer case. <img src="/forums/images/graemlins/smile.gif" alt="" />

While I agree that you should run dyno-juice for the first 1,000 miles for a better break-in. Nobody can "void" a warranty based on the use of an oil that meets the specifications. Unless they provide the "correct oil" free of charge. See the quote below.

While the Magnuson-Moss Act does not require manufacturers to provide a written warranty, it provides specific rules when one is provided. Among those provisions, FTC regulations state: ô(c) No warrantor of a consumer product may condition his written or implied warranty of such product on the consumerÆs using, in connection with such product, any article or service (other than article or service provided without charge under the terms of the warranty) which is identified by brand, trade, or corporate name; except that the prohibition of this subsection may be waived by the Commission if û ((1)the warrantor satisfies the Commission that the warranted product will function properly only if the article or service so identified is used in connection with the warranted product, and (2) the Commission finds that such a waiver is in the public interest.ö ((42 U.S.C.2302(C))

That means your warranty stands when you use AMSOIL Synthetic Lubricants.

Vehicle manufacturers recommend lubricants according to their viscosity grade and service classification. Any oil, whether it Æs conventional petroleum motor oil or synthetic, meeting the correct viscosity grade,5W-30 for example, and the current API SL and ILSAC GF-3 North American service classifications may be used without affecting warranty coverage. AMSOIL motor oils are recommended for use in applications requiring these specifications.