Okay, i just bought some 80W-90 gear oil. My questionis, what weight can i get away with and still work just fine. The user manual that i have for the 2003 says 75W-85 only. If anyone knows anything about gear oil weight and can help me out, please help. If i cant use this HYPOY C gear oil, i'll just take it back and get the lighter weight stuff.

What vehicle is this going in?

What vehicle is this going in?
200sx se-r.

I don't know where you got the Hypoy C from but return it. If I remember right the Hypoy C is a limited slip additive or something like that. Get some MTL or Motul 300. There is a forum member trying to sell theirs. Here is the link:

http://www.sr20forum.com/showthread.php?t=96602

Enjoy!

I don't know where you got the Hypoy C from but return it. If I remember right the Hypoy C is a limited slip additive or something like that. Get some MTL or Motul 300. There is a forum member trying to sell theirs. Here is the link:

http://www.sr20forum.com/showthread.php?t=96602

Enjoy!
On the back it says for performance car or light truck manual transmissions. :confused:

"Engineered for passenger cars and light trucks operating under high-stress conditions."
I don't know if my car is high-stressed or not. I beat up on it pretty hard ***. I wonder if this will cause hard shifting. The only reason im changing the gear oil is 'cause the car is hard to shift. The clutch has the right amount of play so i know that's not it. I bought the car with 116,000 miles on it and i think it has the original oil. :dumbass:

I just know that those gear oils work and work very well. Not sure about the Hypoy C then.

"Hypoy C 80W-90: exceeds API MT-1 lubricant for non-synchronized manual transmissions used in buses and heavy duty trucks as well as API Service GL 5 lubricant for extreme pressure conditions. Recommended for service fill of all limited slip differentials in passenger cars and light trucks calling for SAE 80W-90 and API Service GL-5 specifications. Recommended for applications calling for Ford ESP-M2C154-A and GM 9985290 and is Mack GO-H approved. "

Straight from Castrol's website. If this is it then it is definately wrong. Return it.

I just know that those gear oils work and work very well. Not sure about the Hypoy C then.

"Hypoy C 80W-90: exceeds API MT-1 lubricant for non-synchronized manual transmissions used in buses and heavy duty trucks as well as API Service GL 5 lubricant for extreme pressure conditions. Recommended for service fill of all limited slip differentials in passenger cars and light trucks calling for SAE 80W-90 and API Service GL-5 specifications. Recommended for applications calling for Ford ESP-M2C154-A and GM 9985290 and is Mack GO-H approved. "

Straight from Castrol's website. If this is it then it is definately wrong. Return it.
Thanks for your help man. Very much appreciated.

go with some redline MT-90, as long as you arent turbo or anything. www.myoilshop.com

I'm pretty sure you need a GL-4 oil as the GL-5s will eat up the synchros

^^ yes sir.

I'm pretty sure you need a GL-4 oil as the GL-5s will eat up the synchros
Yea that's exactly what i was thinking. But then i hear that the redline eats up synchros too. Oh well, ill just get the cheap stuff from the dealer or what not. That stuff works amazingly well in my experience.

I just looked in the Chilton manual and it said that 80W-90 was recommended. Crap wtf.

Just go buy some Castrol Synthetic, whatever W90 Gear Oil and forget about it.

"Hypoy" would be short for Hypoid...centerline offset between the pinion shaft axis and the crown wheel. Bevelled Helical Gear set. Like in 99.9% of all stand alone rear differentials. Done in order to reduce noise, however requires special additives to protect the gear's inherently higher friction factors.
Your car is a not a Hypoid type ring and pinion.

Yea that's exactly what i was thinking. But then i hear that the redline eats up synchros too. Oh well, ill just get the cheap stuff from the dealer or what not. That stuff works amazingly well in my experience.

once you've used a good SYNTHETIC gl-4, you'll never go back to 'dino grease'. especially for those cold SLC winters. redline mt-90 is the redline to get, mtl is too thin.

Ric
97 se-r w/all synthetic fluids

^^^^ i agree 1000%, once you have used some full synthetic redline, you will never go back. it is a thousand times better.

^^^^ i agree 1000%, once you have used some full synthetic redline, you will never go back. it is a thousand times better.
How is it "better" I know it is supposed to provide better friction properties of the synchros, but how does it feel? Smoother shifting? I've seen a lot of guys in this forum make vids of themselves driving and they can downshift really easy. My car, however, requires me to double clutch to downshift. Otherwise it just won't go in. For example: if im in 5th gear going about 45 mph, if i try to downshift to 2nd it won't let me unless i double clutch.

that sucks.

So what's a good synthetic? I need to change mine soon (when I get my axles in), what kind should I get and how many bottles for a full fluid change? Is there any good way to flush it before I put the new stuff in?
I don't believe there is a way to flush, but i wouldn't worry about it. From what i hear you have to fill the tranny through the fill hole until it starts to ooze out then you cap it. I believe it is about 4 qts. Yea sometimes when i try to double clutch the tranny grinds a little. The synchros are still good i believe. Just the fluid is dyno piss.

How is it "better" I know it is supposed to provide better friction properties of the synchros, but how does it feel? Smoother shifting? I've seen a lot of guys in this forum make vids of themselves driving and they can downshift really easy. My car, however, requires me to double clutch to downshift. Otherwise it just won't go in. For example: if im in 5th gear going about 45 mph, if i try to downshift to 2nd it won't let me unless i double clutch.

believe me buddy, you will be able to downshift to second at 55 with no problem if you use redline. the shifts are precise, smoothe, and effortless. i thought it wouldnt be a big difference untill i tried it. believe me.

sweet, so has anybody had any problems with mt90 eating the synchros? I think it's just speculation but some ppl believe that it significantly reduces tranny life.