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      02-04-2020, 06:20 PM   #1
N55Msport
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F80 6 speed manual fluid analysis

(I posted this earlier in a wrong section)

I'm not sure if an F80 manual gearbox fluid analysis has ever been posted before. So here is one. The reason for the test is that back during a 50,000 mile gearbox fluid change I had an issue while removing the drain plug. Halfway through the removal while turning with my fingers the plug started to bind eventually being stuck to the point where I had to re insert the hex drive and use a wrench to fully remove the plug.

The plug ended up having a slight burr on it which caused a few shavings and specs of metal both on the plug and the threaded hole on the gearbox. I bought a new drain plug, and again as the bolt went in halfway, it ended up binding a little bit but eventually worked past whatever was causing resistance.

I've done many gearbox changes on BMW's before but never noticed this much material on drain plugs before so, with my OCD, and not sure if the new plug pushed slightly damaged thread material up into the gearbox, I decided to run the gearbox oil for a little over 10,000 miles, do a second flush, and have the fluid tested just to see if anything odd would show up. During this fluid drain the plug still had a bit of resistance while taking it out along with very small metal particles still showing on the threads, but not nearly as much as the first drain.

For now, I've had 2 new drain plugs installed, and at this point I'm most likely rethreading a slightly damaged drain hole from either new gearbox material or an initial bad plug from the factory.
Aside from the shearing that Blackstone noted, everything looks normal.
Pretty tough machines.
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      02-13-2020, 01:57 PM   #2
nbennettksu
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Values look spot on
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      02-15-2020, 11:45 PM   #3
doug_999
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Posted mine here

Tranmission Oil Change Yes/No https://f80.bimmerpost.com/forums/sh....php?t=1576053
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