Looks like dirty engine oil. Don't know if the "dirty color" is from the engine compartment or if it is indeed engine oil. I'm fairly certain it's not transmission oil... no red tinge at all...

-l-

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'84 300d turbodiesel (83K miles)
'96 300d (226K miles)
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other fine diesels...
'99 Polaris diesel (Fuji Heavy Industries single)
'01 Diesel Trail gator (Yanmar triple)
'95 John Deere 970 (Yanmar quad)
'11 BMW 335d
'12 VW Jetta TDI

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'00 BMW K1200LT
'02 BMW R1150RS

'15 BMW R1200GSA