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Old 11-08-2017, 09:26 PM   #2
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Part I.

Research on the correct grade of gearbox oil:-
Previously the most common manual gearbox oil used by VAG was a 75w90 which was to an old VW standard of VW 501 50. Now VW uses a part number & it was suggested that the MQ250 gearbox takes part No.:-G 052 512 A2 (A2 designates quantity of 1lt bottle). VWUK have NO specifications on the gear oil other than the VW part number & apparently the bottle it comes in has nothing written on it either. So it’s a big secret!!

When I went onto various oil brand websites & used their selector apps, I was either recommended a 75w, or a 75w80. So I phoned up a couple of companies in the UK & both stated that I should only be using a 75w & the 75w80 is the wrong oil!

However when looking at my spec of Golf on a web site with VW ETKA parts catalogue it states my MQ250 QSZ gearbox as having "high performance gear oil" part No.:- G 052 527 A2!! Looking through all MK7 manual gearboxes there are two oils listed, a “basic grade” which is based on MQ number, i.e. an MQ250 basic grade oil is a different part number to a MQ350 basic grade oil. However ALL gearboxes have a “high-performance transmission oil” option listed & all are the same part No.:- G 052 527 A2

So what do we do for our MQ250?? Easy, look at the gear oil “recommendations” & chose one that meets both the G 052 512 A2, & G 052 527 A2 standards.

Both of these oils meet the recommendations of the G 052 512 A2, & G 052 527 A2 standards. I used Fuchs Titan Sintofluid FE SAE 75w, as easier to get hold of.

Fuchs Titan Sintofluid FE SAE 75w:-
Density at 15 °C (DIN 51757) = 0,873g/ml
Kinematic viscosity at 40°C (DIN 51562-1) = 40.8mm˛/s
Kinematic viscosity at 100°C (DIN 51562-1) = 6.7mm˛/s
Viscosity index (DIN ISO 2909) = 119
Flash point, CoC (DIN ISO 2592) = 221°C
Pour point (DIN ISO 3016) = -44°C

ROWE Hightec Topgear FE SAE 75w80 S:-
Density at 15 °C (ASTM D-7042) = 0,854g/ml
Kinematic viscosity at 40°C (ASTM D-7042) = 37.8mm˛/s
Kinematic viscosity at 100°C (ASTM D-7042) = 7.5mm˛/s
Viscosity index (ASTM D-7042) = 173
Flash point (ASTM D-92 / DIN EN ISO 2592) = 180°C
Pour point (ASTM D-97 / DIN EN ISO 3016) = -44°C

What is very strange is that the Fuchs 75w80 does not meet either of the two standards required for our gearboxes & yet the ROWE is a 75w80 & does meet both standards!

So DO NOT go by the “W” rating, only go by the “recommendations” list on the oil bottle!!

Quantity required:-
MQ250, 5 speed = 1.8lt for normal oil change. 2.0lt for gearbox dismantle & rebuild
MQ250, 6 speed = 2.1lt for normal oil change. 2.3lt for gearbox dismantle & rebuild
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Last edited by golfdave; 12-03-2017 at 05:55 PM.
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