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Ask Mobil Archive -
Gear Oils
DateQuestionAnswer
04/16/2012
What Causes Gear Lube to Darken and Thicken?
I drained the fluid in my Dana rear axle recently and replaced it with Mobil 1™ Synthetic Gear Lube LS 75W-140. I noticed that the old gear lube was very dark and thick. Do you have any idea why this ...
The fact that the oil turned dark is very normal. This may be from normal oil break down for heat and degradation due to service. As oil heats up during normal operation, it begins to thicken due to o...
03/06/2012
Using Limited Slip Gear Lube in a Conventional Differential
Mobil Delvac Synthetic Gear Oil 75W-90 is approved for MB 235.8 specification. Can I use Mobil 1 Synthetic Gear Lube LS 75W-90 instead? The reason why I ask is I couldn't find the Mobil Delvac at any ...
It depends on what your owner’s manual recommends for this application. If an API GL-5 gear oil is recommended, either product can be used. If gear oil approved for MB235.8 only is required, then only...
01/13/2012
Is Mobil 1 Synthetic Gear Lube LS 75W-90 a Good Choice for a BMW All-Wheel Drive Wagon?
I've got a 2005 BMW 325xi, and was wondering if your Mobil 1 Synthetic Gear Lube LS 75W-90 would be suitable for both the transmission and the differential for the all-wheel drive? I was told to go wi...
We recommend first consulting your owner’s manual for the appropriate viscosity grade and any other specifications required for oils being put in the driveline of your BMW. Mobil 1 Synthetic Gear Lubr...
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...
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