The first time at 133,000 miles and it stunk beyond belief. If you have ever done the job you will know how bad it can be.

Both times I used a quart of Red Line MT-90 75W90 Gear Oil with a M1 top up for the last bit.

This time out 72,500 miles later and it was dark in color but still smelled fresh.

Doesn't cost much for lots of protection and peace of mind.

Same old tip "REMOVE THE FILL PLUG BEFORE THE DRAIN PLUG!" You know why!

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250

About to do it for first time on my 98 at 79k miles....plugs too rusted to insert hex bit into, so I've been spraying with penetrating oil and will try again soon.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I had the same thing happen on a BMW M3.
I "polished" the hex just slightly on a grander, tapped it in with a hammer and all was well.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250