From digest.v7.n1082 Thu Feb 5 23:10:28 1998
From: Marshall Goldberg <mgoldberg_at_sdesigns.com>
Date: Thu, 5 Feb 1998 19:30:11 -0800
Subject: RE: Mobile 1 Oil
>> As far as waiting until a certain number of miles before using
synthetic oils, consider the fact that all brand new Porsches come
standard with Mobil 1 synthetic oil as do new Corvettes. In other
words, there is no reason why you cannot add it from the very
I've read from several sources that an engine should be "properly"
broken in before introducing synthetic, which I think is in order to
prevent the cylinder walls from "glazing". But Mobil contradicts this
and states that you can use Mobil 1 on a brand-new engine, and no
break-in is necessary.
Here are some URL's I've found on the subject:
"Mobil 1 is compatible with conventional oil should it be necessary to
mix the two. However, the superior performance characteristics of Mobil
1 will be reduced by diluting it with conventional oil."
...and on the same page, they mention that no engine break-in is
necessary with new engines.
>From what I've read, I'm going to go 100% synthetic in my 20,000 mile
328i at the next change. Now I just have to figure out which weight to
use. Mobil 1 comes in four weights: 0W-30, 5W-30, 10W-30 and 15W-50.
Based on the Mobil recommendations, and since I live in the San
Francisco area, I think I'll use 10W-30 year-round.
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