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Ask Mobil Archive -
Gear Oils
DateQuestionAnswer
02/22/2010
Is There a Gear Lube Specific to GL-4?
My vehicle is a 1992 Nissan 300zx and requires a single GL4 gear oil in the manual 5-speed synchromesh tranny. Does Mobil make a synthetic gear lube that is a specific GL4? I read on the label of some...
API GL-5 gear oils can be acceptable for differentials but generally are not recommended for transmissions because a GL-5 gear oil has twice as much Extreme Pressure additive for GL-5 quality gear pro...
02/15/2010
Does Mobil 1 Synthetic Gear Lube Corrode Yellow Metals?
Is Mobil 1 Synthetic Gear Lube LS 75W-90 gear oil OK to run in Harley Transmissions? The big buzz on the internet chat rooms is that it corrodes "yellow" metals, such as brass and copper. Is this true...
Unless the transmission specifically recommends an API GL-5 fluid for your transmission, it should not be used. GL-5 gear oils are designed for gears that require a high level of EP (Extreme Pressure)...
09/23/2009
Gear Lube Effect on Transmission Brass Components
In regard to the Mobil 1 Synthetic Gear Lube LS 75W-90 Gl-5 LS gear oil. Does the statement "Excellent rust, staining and corrosion protection of copper and its alloys" mean that the additives in the ...
Nissan recommends a GL-4 type gear lubricant for your Pathfinder. Mobil 1 Synthetic Gear Lube is an API GL-5 gear oil and would not be recommended for your manual transmission. 
07/06/2009
Will Gear Lube Viscosity Difference Cause Problems?
My vehicle is a 1997 Toyota Supra non-turbo and the replacement for differential oil says that I need Hypoid GL-5 SAE 90 gear oil for temperature above 18°F or 0°C. It says that GL-5 80W-90 is ok but ...
The sales person made a great recommendation.  Mobil 1 Synthetic Gear Lube LS 75W-90 is an excellent choice. It will still provide the right operating viscometrics since it is an SAE 90 grade at tempe...
05/05/2009
Any Compatibility Concerns with the Plastics Used in Bearing Cages/Spacers?
I have read on club/owner sites not to use Mobil 1 gear oil in Moto Guzzi transmissions or BMW final drives because some of the plastics used in bearing cages/spacers are not compatible with the oil. ...
We checked with our EURO car experts and they say what you've read is not accurate. Mobil 1 gear oils are premium products that will work well in your tranny. The lube recommendation for the final dri...
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