[SoCal Racer]

I am having a shop prep my ZL1 for a track day. since the car will already be worked on, I asked for a differential fluid change and they noted on their estimate...

Red Line 75W90 GL-5 Gear Oil

Obviously, I know the Red Line brand,...but I know throughout this forum that people insist to use the OEM AC Delco which I understand. Just curious if anyone has tried this and if there were any thoughts, good or bad....thanks

[Joshinator99]

Originally Posted by SoCal Racer

I am having a shop prep my ZL1 for a track day. since the car will already be worked on, I asked for a differential fluid change and they noted on their estimate...

Red Line 75W90 GL-5 Gear Oil

Obviously, I know the Red Line brand,...but I know throughout this forum that people insist to use the OEM AC Delco which I understand. Just curious if anyone has tried this and if there were any thoughts, good or bad....thanks

Running it in my SS rear diff currently. Not sure the difference (if any) vs a standard ZL1 diff, but I’ve always had good luck with Red Line stuff. I’m not quite stock, either.

[ZX-10R]

Amsoil Severe Gear is #1 based on standardized tests I've seen

[Z OH 6]

I've only used it in my 892whp Hellcat but it performed just fine for over 3 years.

[SoCal Racer]

Originally Posted by Joshinator99

Running it in my SS rear diff currently. Not sure the difference (if any) vs a standard ZL1 diff, but I’ve always had good luck with Red Line stuff. I’m not quite stock, either.

Thanks...I figured Red Line would be fine. I have used it in many vehicles previously, but when searching in this forum people always direct you to use OEM. It's odd because aftermarket is typically more expensive than OEM, but not in this case.

[Joshinator99]

Originally Posted by SoCal Racer

Thanks...I figured Red Line would be fine. I have used it in many vehicles previously, but when searching in this forum people always direct you to use OEM. It's odd because aftermarket is typically more expensive than OEM, but not in this case.

[SoCal Racer]

Originally Posted by ZX-10R

Amsoil Severe Gear is #1 based on standardized tests I've seen

I would think most aftermarket fluids would be better, but if you read through the threads in this forum they mostly advocate OEM. If aftermarket fluids were not atleast as good (if not better) than OEM, I would think they would be out of business...

[ZX-10R]

They are better, no question - but it's "OEM or your car will blow up, warranty voided, etc etc" type dogma parroted by ignorant people - the science is irrefutable (standardized testing, and to lesser extent, UOAs)

Same with oil filters

[UnknownJinX]

I do recall that when I mentioned that I use Motul Gear 300 LS in my eLSD, a bunch of people told me not to. I personally don't have any issues with the fluid, and I do take mine to the track.

The only reason I can think of is maybe some are concerned if there is enough limited slip additive in some of the aftermarket fluids, but as long as you get something designed for clutch-based LSD, then they should have enough additive in it to prevent any issues.

Originally Posted by ZX-10R

Amsoil Severe Gear is #1 based on standardized tests I've seen

It looks like Amsoil Severe Gear 75W-90 will work, though I personally do not feel like messing with adding their Slip Lock additive(how much to add, if I need it at all, etc.) when I can just buy Motul Gear 300 LS and it's already got the additives in it. Same with Red Line Gear Oil, it already has the friction modifier in it.

[AZ_1LE]

Originally Posted by UnknownJinX

I do recall that when I mentioned that I use Motul Gear 300 LS in my eLSD, a bunch of people told me not to. I personally don't have any issues with the fluid, and I do take mine to the track.

The only reason I can think of is maybe some are concerned if there is enough limited slip additive in some of the aftermarket fluids, but as long as you get something designed for clutch-based LSD, then they should have enough additive in it to prevent any issues.



It looks like Amsoil Severe Gear 75W-90 will work, though I personally do not feel like messing with adding their Slip Lock additive(how much to add, if I need it at all, etc.) when I can just buy Motul Gear 300 LS and it's already got the additives in it. Same with Red Line Gear Oil, it already has the friction modifier in it.

Pretty sure you dont have to worry about having friction modifier in the fluid because the clutches in the eLSD are sealed off and are lubricated by separate fluid you never really need to touch. So you basically just need some good gear oil in there and that's it.