im just curious what a good one would be

 

Amsoil
Redline
Royal Purple
etc..

 

Redline is tha shizznit, the guys from Atkins told me to use it and I've been happy so far. Just don't get the shockproof gear oil, it tends to leave a residue that you don't want.

 

redline has mixed results. I say go for it. I decided once that no gear oil was the way to go for about a mile or so. Kinda found out the hard way they like to scream real nice and loud when you do that. Go for the redline

 

I still use redline 75-90 diff specific

 

I use Redline Super Light Weight Shock Proof in all my differentials.

It is a synth gear oil that has the shear and film weight of a 85W90, but has the flow weight of a ATF for less diff HP loss.

 

Racing Beat sells the Royal Purple and swears by it. Thats what I would use for both gear box and diff.

 

Royal Purple

 

Royal Purple, Max Gear in tranny, beats Redline MT90 hands down, at least in my gear box. Shifts better, quicker engagement, less effort, no grinding.

I still use Redline 75W90 in the diff, but will try Shockproof super light next time, heard some good stuff about it.

 

Red Line 75w-90, already has the LSD additivie in it. Bonging gear oil time!!!!!!!!

 

Shockproof is some interesting stuff isn't it Mark. The superlightweight will add more powah but it will also doesn't protect as well. The Redline website used to say that it's for use when wear and tear are not an issue and maximum hp are desired.

I bought some Shockproof Heavy and I was talking to one of the reps at Redline about it. I was suprised he freaked out. Said that I should never run shockproof in a street driven car. I said that I will open track and race it at autocrosses then he backed up and said that he would still use 75-90 but he guessed it was okay that I ran shockproof if I added 2% LSD additive to the mix.

That being said I'm running Royal Purple Max Gear right now. It comes with the LSD additive. I've had it in there for about 3K miles and it seems to work great.

I'm kinda suprised he was so negative about me running his product :-/

 

That's weird... Is it really that bad to run the superlight shockproof? I just ordered it for my diff and I dont wanna hurt anything...

 

Okay let me rephrase it.. It won't EAT your gearbox.. I'm sorry that was wrong of me to post that. It doesn't protect as well. That's better.

I just went into the garage and grabbed a bottle o' Shockproof off the shelf and it says on the label.

"..if further improvements in efficiency are desired and durability is not a major concern, Lightweight and Super Lightweight shockproof can be used."

and

"Shockproof chemestry allows the use of one of the lighter viscosities in many performance applications with little sacrifice in durability."

So basiclly it doesn't protect as well as say Shockproof Heavy or a regular 75-90 but it gives more performance. There is also the issue of having to add in more additive as I already mentioned above. Redline says it adds a little LSD additive to Shockproof but it's not enough for regular driving so that's why it's not on the bottle.

I got shockproof heavy cuz it's some cool sounding stuff.. it protects like a 75w250!! but flows like a 75w90

 

Wait so you have to add this additive? What is it?

 

Here's the email and reply I got back from Redline... this wasn't the conversation where he said not to use it in a street car.. just that it was better suited for race. I can't find that email and all the emails I have from Dave basicly say that as long as the oil gets hot enough then it's fine to run... It's late for me so maybe I am getting the conversation mixed up with one I had with someone else about it but I thought I kept documentation.

Basicly what I said before still stands. Light and superlight add more power but it doesn't protect as well.


Hello, I just bought a few quarts of Shockproof Heavy to put in the
>LSD of my 1987 RX-7 tubro. Does Shockproof Heavy have LSD additive
>for the clutch type LSD on my 7, or do I need to get the additive?
>
>I notice a small line that says for use in Limited Slip
>Differentials but it doesn't actualy say it contains the additave.
>
>THANKS!
>
>Jon Sotelo

The ShockProof gear oils do contain some friction modifier though
generally not sufficient to reduce chatter in a clutch type limited
slip differential on the street, you may need to add an additional
2%. The ShockProof lubes are designed and better suited to race use,
so don't contain as much friction modifier as may be needed.

Regards, Dave
Red Line Oil

 

Slightly off topic, but do you all run in the transmission? I was going to go with Redline MT90, but the Haynes manual says to use an API GL-5 lubricant. On the Redline sight, it says GL-5 lubricants greatly increase syncromesh wear unless specificalyy designed for it. I don't really trust my Haynes manual.

 

Mazda Specs out Gl-4 or non corrosive GL-5 in the owners manual. I run MTL90 right now GL-4 but have run Royal Purple Max Gear as well non-corrosive GL-5.

Shockproof superlight is what a lot of people run right now but it's super slippery and the whole point of MTL90 is the first place is that it's not too slippery so the synchros can engage... so go fig..

 

Cool, thanks. I have some MT90 already so I don't need to spend more money.