This is consistent with what Pentosin said after I emailed them.
Quote:
Dear Mr. xxxxxxx,
Thank you very much for your email.
Referring to our below stated email we would like to inform you that we also talked internally to our head of the R&D department. Please be informed that our Pentosin ATF 1 is
approved by
a) VIOTH Extended Drain Intervals List of Lubricants H55.6336.3x / DIWA Service Bulletin 013 and 118
b) ZF lubricant class/es TE-ML 11B
Shell M-1375.4 which happens to be a ZF Lifeguard 6 ATF for ZF\'s 6 spd transmission applications.Our Pentosin ATF 1 meets the requirements and is suitable for 5 HP.
Please be informed that there is no written confirmation for 6 HP, thus we cannot confirm it.
We trust we could help you. In case of any further support, feel free to contact us at any time. Best regards from Hamburg.
mit freundlichen Grüßen / kind regards
Ole Sommer
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So basically even though RMEuropean says its an approved substitute for the BMW OEM fluid (Shell M-1375.4/Lifeguardfluid6), Pentosin actually says otherwise. I also have to believe based off emails I received from ZF, that no other fluid (Castrol, Red Line) can be considered as a direct equivalent, even though they might say as such on their website.