Redline 75W90 or 75W90NS

If you are happy with the shifting behavior, and the LSD clutches aren't making noises = no need to change it. I know the Redline 75W90NS has many positive recommendations here, but my experience was that the cold-shifting was excellent, however the groaning noise from the LSD clutches going around a corner from a stop was just unacceptable so had to go to something else.

 

What does the "NS" mean and do?

 

They leave out a "friction modifier" in the NS:

https://www.redlineoil.com/product.aspx?pid=47&pcid=7

 

What's been talked about over the years is to use the "NS" then if you have the turning issues you add just a little bit of friction modifier at a time. I can't remember but I think it's a GM product and can be bought at any parts counter.

I personally had not so great results with the Royal Purple and Redline. The one oil that seemed to really work was the Monolec brand. I don't currently have that in the tr now.

Shamile

Freeze. . . Miami Vice!

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Interesting. I've been using RL 75W90NS for 13yrs with not a hint of a problem.

 

I wonder if this'll work?

https://www.walmart.com/ip/Super-Tech-75W-90-Syn-Blend-Gear-Oil-1-Quart/16795248

Only $5 a quart!

 

we used it in our big ol' die cutters at work without any issues. Mostly because it was always available and met the requirements the manufacturer established for our stuff.

In a car? Where the alternative is only a few bucks more? I dunno if I'd do that without some serious homework.

D

 

I just know this for the 3x8 and Mondial transmissions, but I'm guessing it's the same with other Ferraris of the same era: The Gearbox (synchros) work better without Limited slip additive, so NS would be better. Some people add a bit of additive seperately if they have chatter in the corners. Some have used 1 quart of regular (limited slip additive already included) Red line and filled the remainder with NS Red line.

 

I tried the Redline NS in a Daytona and was not pleased. It did not improve shifting over Amsoil and definitely caused LSD clutch chatter. Adding quantities of the Redline LSD additive also did not correct the chatter. Tried Mobil 1 plus a tube of LSD additive and was very pleased. The shifting noticeably improved over any oils tried in the past and the LSD chatter disappeared.

 

Same here (but didn't try Redline NS + the GM additive)

What brand of LSD additive?

 

Daytona has very different syncros and was never designed for GL5. Porsche style syncros often don't work with GL5.

 

Steve: Off the shelf at the local parts store.

Brian: Early 365 Boxers (through 17543) used the Porsche synchro rings. Do you know for sure that Shell 1747A (factory fill for Daytona's) was NOT a GL5?

 

If it shifts fine I would leave it in

 

GL5 specification did not exist prior to early 90's so I am pretty sure. Ferrari lubricant specifications until the 1994 TR512 was for GL4.

 

Brian: Time flies. I would have sworn that GL5 oils went back further than that. I do know that S1747A was a standard EP 90 wt gear oil with a LSD additive added by Shell.

 

I though GL5 was really for trucks and heavy macheinary. I can see it working in a race situation where there is serious great stress on gear teeth and redline shifting.

As a side note on redline MT90. the Gearbox in lotus elise is a known weak link especialy in track situations, where synchros are not known to last. I have put MT90 in my elise from day 1, it has 70000 track miles now and shifts as sweet as day 1. The same oil now goes in my exige v6.



The Mt90 just takes a little while to warm up.

great stuff,

 

I think the motul line, based on specs looks like a good candidate for our trs and 512

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I know. Getting old sucks.


Lots of GL4's had LSD additive because that's all there was. During the 80's early 90's Ferrari called either for Rotra LS or Shell SP FE LS. In both cases the LS stood for Limited slip. Rotra is now called LSX and is GL5.