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Ask Mobil Archive -
Gear Oils
DateQuestionAnswer
07/30/2010
What are Friction Modifiers?
Please explain what Friction Modifiers means? Example: Mobil 1 Synthetic Gear Lube LS 75W-90. So LS means it has more Friction Modifiers. Does "Friction Modifiers" mean it has more slippery for LSD's ...
Friction modifiers are designed to do what the name implies, they modify friction. In the case of a Limited Slip Differential (LSD), the friction modifiers are designed to modify the friction characte...
05/29/2010
Clarify Comments on Use of GL-5 vs. GL-4 Gear Oil
Concerning the GL-5 gear oil, on your website you state the following: "Mobil 1 Synthetic Gear Lubricant LS 75W-90 can also be used in rear axles where API Service GL-4 lubricant is recommended." Howe...
There are transmission applications that recommend API GL-4 type products where we would not recommend using an API GL-5 fluid because transmissions typically have components made from “yellow” metals...
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. 
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