That's another thought. My hope is that 1) I'm not that high mileage, 150K or so and 2) there was a maintenance sticker on the car when I bought it and I talked to the mechanic so I have reason to hope it was well maintained. But, you mentioned getting an analysis done and that is cheaper than changing the fluid on general principle.

On 10/27/2012 9:05 AM, Curt Raymond wrote:
You work up to longer duration changes, the first couple changes just scrub out 
all the crud that built up either from using inferior quality stuff or from 
poor previous maintenance on the previous owner's part.

When I first got my '85 190D oil analysis showed high iron levels in the engine oil. 
After a few changes with Mobil 1 the iron levels went down to normal and stayed there 
even with 10,000+ mile oil changes. The previous owner swore to me he changed the oil 
"every 5,000 miles" but I don't recall any mention of what oil he'd used.

I always assume the previous owner was and idiot (well except for the car I 
bought from Dwight) and maintain it accordingly.

-Curt

Date: Sat, 27 Oct 2012 08:21:59 -0700
From: Alan Clarke <alanc...@pacbell.net>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] Amsoil ATF in an older transmission
Message-ID: <508bfc17.1070...@pacbell.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Doesn't doing several changes defeat the purpose of going to synthetic,
namely extended fluid change. BTW, when I first got my vehicle I stocked
up on both Amzoil for the engine as well as this transmission fluid
which I am now talking about using.  This isn't cheap stuff but on the
other hand it's cheaper than  transmission repair down the road.

On 10/27/2012 7:52 AM, Brian Toscano wrote:
when I changed my transmission over to Mobil synthetic ATF it came out
dirty the first several times - lots of black stuff in the fluid.  Not
chunks, but just not clear.  I guess it came from the bands.  Similar with
the differential.  On two diesel trucks I owned, changing to synthetic
caused one to develop a rear main leak while the other was fine.  I would
say YMMV.
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