I have used MT-90 in my E39 for 8 years, cold Nebraska weather, zero issues.
The Transfer case FILL bolt: it was so tight, I almost stripped it. So heat it if you think it is on too tight. On re-installation, I put a tiny dab of antiseize of the FILL bolt to make it easier next time.
PS @Green-Dragon, How is your Schmiedmann Custom SSK doing?
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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