Thread: sr20 tranny fluid.

I previously used Genuine Honda Manual Transmission Fluid.

Now using Amsoil Gear Lube.

Peace

Peace

My mechanic (Mike) says you can use GL4 or GL5 per Alldata for a B15 tranny. He specifically looked it up because he dumped the Redline Heavy Shockproof (I ordered from Summit) into my B13 tranny.

Therefore he went with Castrol GL5 rated 80/90 with an LSD additive. It was on-hand and readily available.

Should I be using something else in the B15 transmission? Is there a difference in the requirements for a B15 transmission vs. a B13/14 tranny?


Should I go MT90 in my B15 transmission?

I cannot find a thread that definitively states what to use in a B15 transmission. Everyone (including me) is always yapping about the B13/14 trannys. Does everything that we discuss with B13/14 trannys apply to B15/P11 transmissions?

It already appears to me that the B15 tranny can use either GL4 or GL5 (per Alldata, unless Alldata is wrong) and I *thought* that the B13/14 trannies could only use GL4.


Uh....dammit. That is from the other "tranny fluid" thread linked above.

What are the weights/viscosity's of the Redlines you have listed above?

Is the MT90 the 75w-90? Is that what you recommend?

DE with bolt-on's, in the future VE with bolt-ons and tuning. Daily driving and occasional road course (once a year or so...) use.

B15 LSD transmission, G-Spec Stage 3 clutchkit, Andreas Miko Tranny Saver Bracket, Prothanes.

Which tranny fluid is optimal?

Assuming this is correct, then the B15 transmission is not going to be nearly as picky as the B13/B14. Get the right weight and you should be good to go. The Redline stuff is great, so I'd still go with that, but you could go with most anything.

The reason the B13/B14 transmission require GL-4 fluid, is because of the composition of the synchros. Those transmission use brass synchros. Sulfur eats away at brass synchros and prevents them from having the correct coefficient of friction, so usually you experience gears grinding very soon after putting GL-5 fluid in. GL-4 has much less sulfur if I am remembering correctly.

The real question now is, are there any brass parts in the B15 transmission, especially synchros?


All that and more at http://www.redlineoil.com/


For your specific needs I would, yes, but it's not going to be nearly as important in your situation as in those with B13/B14 transmissions.

id run gl 4 in the b15 to stay on the safe side...however ben i NEVER had problems running gl5 in my b13/14 transmissions and i ran that cheap crap murrays choice oil because the trans leaked

Just recently we had a member who was having a lot of issues with his trasmission and synchro operation. He realized it had recently been filled with GL-5 fluid and swapped to GL-4 fixing his problems almost immediately. Can't find the thread right now, but it was maybe a month ago.

yeah i believe it, gl-5 is a hit or miss with our trannies , one guy matt had a turbo ser and ran the murrays crap never hadda prob

in the end YMMV

FWIW, we had put MT90 in our previous b15 tranny (and its still in there) and doing great.

Bumpage.

Anyone using Royal Purple 75W90? I have a few quarts laying around and thought I might throw them into the SE-R's transmission before the drag races on friday night. Car is N/A.

I've got MT90 on order for my B15 tranny. I'll have the fluid changed next week to the "good stuff."

Thank you Ben and Chris!

Napa gear lube is great unless it gets really cold. In the really cold weather it's stiff to shift until the car warms up. It is the most easily available GL4 fluid and it is the cheapest. It is a little heavier weight at 85-90w but feels great.

Here is a post I made about it on g20.net if anyone cares to read. where did all the GL4 go? - G20.net - Forums