75W140 Motul Gear Oil

[Muskoka800]

Any of you track addicts running 75W140 in your Diff or Tranny?
Winter maintenance time here and considering this upgrade if appropriate for my occasional cruise - lapping toy.

[justinco]

Yes, I use it in the diff because I track a lot. I cooked the 75w90 fluid.

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[RedReplicant]

I'm also using it in my diff right now since it is compatible with OSGiken.

[autoracer86]

Originally Posted by justinco

Yes, I use it in the diff because I track a lot. I cooked the 75w90 fluid.

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Did you see any noticeable differences in the way the stock diff worked when you switched to the heavier weight oil ?

[justinco]

Originally Posted by autoracer86

Did you see any noticeable differences in the way the stock diff worked when you switched to the heavier weight oil ?

No, not really.

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[smoltz]

I run it but my car is used mostly on track. Local shop put it in, because I think there is no Motul 75-90 around or because they had found it worked a bit better in one of their shop cars. No complaints but doesn't behave any differently. I don't have a diff temp sensor though so no idea if its helping with temps.

[autoracer86]

Originally Posted by smoltz

I run it but my car is used mostly on track. Local shop put it in, because I think there is no Motul 75-90 around or because they had found it worked a bit better in one of their shop cars. No complaints but doesn't behave any differently. I don't have a diff temp sensor though so no idea if its helping with temps.

I might give the 140w a try. Assuming the data sheet from Motul is correct it's definitely a more "robust" oil. Even though I track its probably overkill for me as temps don't get very hot here and I normally only do a handful of laps before coming in to let things cool down anyway ha

Having said all that the bottle does say COMPETITION on it so....

[Mr_Brian]

Originally Posted by smoltz

I run it but my car is used mostly on track. Local shop put it in, because I think there is no Motul 75-90 around or because they had found it worked a bit better in one of their shop cars. No complaints but doesn't behave any differently. I don't have a diff temp sensor though so no idea if its helping with temps.

Do you notice any difference with gas mileage? I mistakenly put 75-140 in 1 of my other cars and the drag from the rear diff in the cold was extremely noticeable.

[smoltz]

Originally Posted by Mr_Brian

Do you notice any difference with gas mileage? I mistakenly put 75-140 in 1 of my other cars and the drag from the rear diff in the cold was extremely noticeable.

I don't track my mileage that closely. All I know is that I got better mileage with my C8 than I do with my GR86 despite having less than half the power.