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Their could be some carbon too. I read a paper on gear friction saying the contact points on high speed gears under load can get over 1,000F.
This is what triggers ZDDP to coat metal parts with Zn.
Yeah one guy on my nissan leaf dot com changed his gear oil at 80k miles and it looked pretty black.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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