Diff oil looks surprisingly fresh at 100K, anyone else?

[nk_zhp]

Just replaced the rear end oil, the car has 100K miles and as far as I know the oil is original. It had goldish tint to it. Expected to be essentially fully black or at least not at all see-through. Also its consistency felt almost identical to the new Redline 75W90 that went in. Anyone else had these results? I am also curious to to hear what the tranny oil looked like for those that replaced it close at 100K.

Had I known, I probably wouldn't have crawled down there.. I realize fresh oil is better than old but practically speaking I feel like it could have gone another 50K.

[WOLFN8TR]

When I did my rear diff and tranny oil at 100K it was dark and nasty! Changing the oil even thou it might not of been needed is cheap piece of mind.

[Vas]

Maybe it was replaced. You can have it tested.

[nk_zhp]

From you sig I am assuming you have an M3. I have an E30 M3 as well and that one needs new rear diff fluid every 15K miles only because I auto-x it and the clutch packs wear out its surface into the oil.

I am starting to suspect that it was done, despite the fact that the ZHP is street driven only with no LSD.

[WOLFN8TR]

I do now, had a ZHP up until Jan 2015 thou.