Date: Sun, 16 Sep 2001 18:30:40 -0500
From: "TANJWarrior" <>
Subject: Re: Does anyone use synthetic oils?

I don't know about this leaking business. If a seal is bad, it's going to be bad no matter what! Deposits can help seal a leak. But the seal will go sometime whether or not synthetic or petroleum lubricants are in the system. For new engines, let them break in before dumping synthetic inside! As for my vehicles, mileage varies at: 924 158,000 944 115,000 928 130,000 Reatta 128,000 Riviera 188,000 I have a noise level meter from my days in electronics and actually measured different audio levels and frequencies. The only "real" measured difference was in the 928 and my motorcycle. The mechanical noise above 8,000 Hz had actually lowered in dB's after synthetic and a proper break-in period. If this means the synthetic is protecting my engines moving components...then it stays! "Merritt Mullen" <> wrote in message > Michael Pardee at wrote on 9/16/01 3:21 PM: > > > Many people who have put synthetic in engines with high mileage have > > suffered oil leaks, sometimes intolerable ones that required major work > > to repair - especially if the rear main seal starts pouring oil. The > > popular view is that synthetic dissolves deposits that coat hardened > > seals, leaving gaps. 50K miles is the point at which most of us get > > uneasy about it. Engines that were changed to synthetic before the seals > > hardened don't have that problem. > > That's a similar problem we had with aircraft engines back in the 50s when > oils containing detergents first came into use. The detergents would loosen > up old deposits which would lodge in oil passages, leading to engine > failure. > > Merritt >

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