Thread: Redline Gear Oil "CHOICES"

Go Fast Depot

^Redline Gear Oil LINK from gofastdepot.com

Ok so I just decided to pick up some redline water wetter, but now I'm in the business of getting some new gear oil. Which would you guys recommend from the list? Would MT90 but good enough for a stock B13 tranny with 252K on it, or would I need some shockproof ? I did some searching on the old forum on it, but I figured we could use some more info over here on the topic. Let's here guys.



#1 -50304

Popular in Nissan, Toyota and Mazda manual transmissions and transaxles as well as other selected applications, this is a 75W90 GL-4 Gear Oil that’s slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.




#2 - 58204

A unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90.




#3 - 58404

A unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures. Similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil. Used in most road-racing differentials with moderate power and dogring racing transaxles.




#4 - 58504

A unique product with the viscosity of 75W90 gear oil but lower internal friction similar to that of an ATF. Used when temperatures are not high and when the maximum power output is required such as in stock car qualifying laps. Used in low-power road racing transxles like Formula Vee and low-power SCCA Production classes (dog-ring type, generally not sycro application where this product can be slippery).


All information above was gathered from GoFastDepot.com. For any questions on ordering this product, you can go to the site, or send forum member Marcos@GFD a PM .

I would recommend the typical MT90 stuff. Transmission millage shouldn't have anything to do with gear oil choice IMO. The need for the shockproof stuff comes when you're making power, not with age.

Edit: And since when were there so many choices for the shockproof stuff?

There have been that many shockproof choices for at least 4 years. That's when I first started using it.

I think that Redline took away their GL-4 and GL-5 type designations for Shockproof though. I recall using the Shockproof because it was GL-4 compliant (ok for our brass syncros in the trans, where as the GL-5 can wear them down), but they are no longer present in the Shockproof line.

That said, I've used all of those oil pictured above. MT-90 was the least noticeable improvement over OEM fluid, followed by Heavy Shockproof (because it is so thick when its cold...its great when it warms up though), Light, then Superlight showing the best increase from a tactile standpoint.

MT-90 see below for long explanation.

The heavy is too heavy for most people. I have it because of the turbo but it may even be overkill for that unless you do roadracing etc. The heavy doesn't work well until it is fully hot so I drive it easy until my oil temp comes up. I figure the tranny fluid will also be hot then.

The light stuff is too light imo. I got some by accident once, and after that I would occasionally scratch gears on upshifts.

^So the lightweight and superlight are lighter than the regular MT-90 even though they have shockproof on the bottle? I could see why, but I was just wondering about the description on them. Anyway, from the post that I have read from you all, the regular MT-90 seems like the choice for me .

Thanks,MR

P.S. More info and opinions are welcome

I like the shockproof heavy. It is a little thick on cold mornings, but it warms up in a few miles of normal driving. I've run it year round in my old daily for probably 40k miles now. I also ran it for a while in my turbo car, but never got around to putting it in after my swap.

B13 and B14 trannies seem pretty stiff on cold mornings even if you have OEM tranny fluid in them.

I mean significantly stiff though, lol.

That's what people say. The Redline MT90 has always been recommended as a fix for this. I guess you get it back if you use the heavy shock proof (or maybe it's even worse?).

^I would assume it would make it worse, but I have royal purple in my tranny at the moment. Makes my tranny stiff as a bull in the morning. I usually have to skip from 1st to 3rd until it warms up so that it don't grind.