Date: Mon, 1 Apr 2002 11:09:46 +0100 From: "Grunff" <grunffnopsam.com> Subject: Re: Mobil 1 = Oil Leak?
"Toby Field" <tobyfieldnopsamail.com> wrote in message news:a887d5$s5r$1nopsam8.svr.pol.co.uk... > Has anyone experienced increased oil leakage due to using fully synthetic > oil. On the last oil change, I decided to have Mobil 1 0w-40 put in my car > since then, it's lost about 250ml a month. after every time I park the car > for prolonged periods, the car has a nice big patch of clean oil on the > floor. I assume it is because it is such a thin oil. > > Toby Field (UK) > '93 9000 CSE 2.3T Auto > 149,000 Miles Yup, I've experienced teh same thing in the past. As Henrik says, it's because the synth cleans the insides, around the seals, very effectively. But there's also some evidence that it causes shrinkage in seals which have been immersed in mineral oil for many years. My recommendation is don't switch from dyno to synth on an older car, unless you've rebuilt the engine, or are prepared to change several seals (particularly crank seals). Grunff
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