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BMW MTF LT-4 is 75W-90 GL-4 too. I currently run it on my Mini.
At 100°C 15.8 cSt, VI 215 btw..
Just changed the manual transmission fluid on my 13 Golf tdi which has never been changed. I got the car just over 6 months ago and now it has 140000km at the moment, I put in some liqui moly top tec 5100 mtf which is GL4 rated, and I can say the shifts are a bit smoother, but that wasn't necessarily the aim... Well, glad I did, old stuff looked like used engine oil
To be complete your TDI has a 02Q/MQ350 transmission and it
came with either VW G 052 171 (up to 9/2012 production) or VW
G 052 527 (from 9/2012 up). Both are very similar and I bet they
are fully replaceable and compatible. The biggest difference is the
price.
I replaced the MTF (G 052 527) on my Mk7.5 GTI at approximately
5000 km on the odo (with Castrol Syntrans V-FE) and for another
time at roughly 50,000 km (G 052 527). They're both excellent and
feel virtually the same. Perhaps slightly different near freezing but
none is perceptibly better or worse.
I replaced their MTF on my Mini and my Porsche in shorter intervals.
I'm a long-time proponent of early transmission oil changes. On this
forum? Repeatedly!
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