2011 320D Manual Transmission fluid spec for change

Xpoppyxx · 10-29-2025, 11:24 AM

Hey folks,

Whilst I know the transmission fluid is meant to last the life of the car, I disagree with that claim and am looking at changing it out on my 2011 320d 6 speed manual transmission. From what I've gathered I think the correct spec should be a MTF-LT-2 75w80 Synthetic GL-4 gear oil.

I've come across this very reasonably priced oil from Westway Lubricants which is £29.99 for 5l, you can find at LINK HERE
Has anyone got any experience with their products or maybe has any recommendations on a better product that also reasonably priced?

Phil325i · 10-30-2025, 07:27 AM

Totally agree with your decision to ignore the BMW 'Lifetime fill' nonsense! I think you'll find the correct viscosity is 75W-90. I know nothing of Westway Lubricants. If you don't want to use the BMW oil, I'd go for a good quality synthetic like this

https://www.ebay.co.uk/itm/171155290215

I'd say 5L is a waste of money as you'll only need 1.4litres...

Xpoppyxx · 10-30-2025, 11:57 AM

Hi Phil
I think you might be right. I direct messaged westway and they think I might have the ZF GS6-45BZ Manual Gearbox which needs a MTF-LT-5 spec oil. I tried checking RealOEM.com using my VIN but it listed both transmissions as possible fitment so it didn't help my search. My understanding is the MTF-LT5 and MTF-LT4 do not mix well together. I guess my only option would be to jack the car up and try and find the identifying plate.
I wad considering the 5l as my sister has the same make/model and with 5L I would have more than enough to cover both vehicles otherwise I would just buy the 2l

10-29-2025, 11:24 AM	#1
Xpoppyxx New Member 8 Rep 13 Posts Drives: BMW 320D E90 Join Date: Nov 2023 Location: Liverpool iTrader: (0)	2011 320D Manual Transmission fluid spec for change Hey folks, Whilst I know the transmission fluid is meant to last the life of the car, I disagree with that claim and am looking at changing it out on my 2011 320d 6 speed manual transmission. From what I've gathered I think the correct spec should be a MTF-LT-2 75w80 Synthetic GL-4 gear oil. I've come across this very reasonably priced oil from Westway Lubricants which is £29.99 for 5l, you can find at LINK HERE Has anyone got any experience with their products or maybe has any recommendations on a better product that also reasonably priced?
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10-30-2025, 07:27 AM	#2
Phil325i Brigadier General 706 Rep 3,315 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Totally agree with your decision to ignore the BMW 'Lifetime fill' nonsense! I think you'll find the correct viscosity is 75W-90. I know nothing of Westway Lubricants. If you don't want to use the BMW oil, I'd go for a good quality synthetic like this https://www.ebay.co.uk/itm/171155290215 I'd say 5L is a waste of money as you'll only need 1.4litres... __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace with cross bar; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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10-30-2025, 11:57 AM	#3
Xpoppyxx New Member 8 Rep 13 Posts Drives: BMW 320D E90 Join Date: Nov 2023 Location: Liverpool iTrader: (0)	Hi Phil I think you might be right. I direct messaged westway and they think I might have the ZF GS6-45BZ Manual Gearbox which needs a MTF-LT-5 spec oil. I tried checking RealOEM.com using my VIN but it listed both transmissions as possible fitment so it didn't help my search. My understanding is the MTF-LT5 and MTF-LT4 do not mix well together. I guess my only option would be to jack the car up and try and find the identifying plate. I wad considering the 5l as my sister has the same make/model and with 5L I would have more than enough to cover both vehicles otherwise I would just buy the 2l
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