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There really isn't an advantage to changing the tranny fluid 'early' unless it's to upgrade to a better fluid. Tranny fluid operates in a 'closed' system and isn't subject to the type of breakdown motor oil is - no fuel or combustion products to mix with it. Also, tranny fluid actually works a little better once 'aged' a little.
In cars w/ yellow metal balks/synchros, changing too frequently can actually hurt these parts because when new, tranny fluid can slightly attack these parts, but once it starts to break-in, it undergoes a chemical change which is more friendly to the internals. Tranny fluid contains a lot of sulphur compounds to better withstand compression and shear and these breakdown over time which is why used tranny fluid has that strong 'rotten egg' smell to it.
The service interval is spec'd to the type of fluid used - to switch it before it becomes too acidic and to drain any fine metal shavings (normal) which have accumulated at the drain plug (usually magnetic). These s/b a fine paste, not actual chunks. If you find 'chunks' see - Troubleshooting...lol!
But, there are probably better fluids out there than OEM MB1. Redline MT/90 is a very good fluid and while I've not personally used Royal Purple tranny fluid, I have a lot of respect for their products too.
When changing, be sure the tranny is warm which means a 10-15 min. run prior to draining it (90W takes a bit of time to warm), the fluid s/b Hot so be cautious.
Also, be sure to open the Fill Plug BEFORE draining it! Not only will this ease the draining, but if The Fill Plug's siezed, or the threads galled, you don't want to find this out after you've already drained it, you want to be CERTAIN that you can refill it.
Last edited by Lil bastard; 11-11-2008 at 02:06 AM.
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