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TheDeadCow
Just some guy
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I am, went with 75W-90 after talking to Tim at OP mustang (I have coolers on my 350). If I remember correctly, the 75W-140 was to help against limp mode on cars without diff coolers but don't quote me on that.
Are you having overheating/limp mode issues on track?
Are you having overheating/limp mode issues on track?
wildcatgoal
@sirboom_photography
90 if you are not road coursing the car or, if you are, you have a diff cooler.
140 if you do not have a cooler (and will road course the car).
140 bought me noticeably more time before I get the diff temp warning.
140 if you do not have a cooler (and will road course the car).
140 bought me noticeably more time before I get the diff temp warning.
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honeybadger
Just don't care
I run 75w-140 in my '17 and my temps were 15 degrees or so cooler than with OEM.
Hack
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There's not going to be a diff temp warning popping up on a 2015 or 2016 GT350 tech / base car. Those cars don't have a temperature sensor in the differential.
It is good to know that a fluid change will reduce diff temperatures though.
It is good to know that a fluid change will reduce diff temperatures though.
wildcatgoal
@sirboom_photography
Translates to more likely to get a full session in on a hot day in the afternoon. Maybe 2 more laps than without it here and there. I just see the warning less. Still get it... just less.
Caballus
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Are there any drawbacks to 75-140? Can it be used on the street as well?
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honeybadger
Just don't care
It's quite a bit thicker. I wouldn't run it on a street car in the winter (as it'll be so viscous and won't lubricate as well). But I wouldn't hesitate in the warmer months (Apr-Nov).
Caballus
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Anybody know if OPM has a discount code for forum members?
CSL
Well-Known Member
I liked the added viscosity since I track the car and push it hard. It was a great middle ground for my intended use and it’s worked great. I did not compare temps with this and the OEM fluid, but no overheating concerns with this. You definitely need to watch the diff temps more closely than the tranny temps.
wildcatgoal
@sirboom_photography
I migrated my way to a person a Torsen itself who said 140 is what they’d recommend if they could. So I don’t have a problem using it in my car. As far as I’m concerned BG 140 has worked great. I tried Lucas Syn 140 in a pinch and I got the temp warning in about the same time as I would with the factory oil. Can’t imagine it can be that bad so maybe I just got faster. Considering I’ve likely hit my peak (ug) I figure BG just is magic sauce.
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