ALFAGTV6.COM

[Mats]

MD: There is a flipside you know... 6 months of no darkness...

[MD]

Yeah Mats trying hard to see the light.....

Sorry Micke but I looked up all the oil companies you mentioned (and more) but come up dry. Nobody specifically endorsed the oil for a transaxle with clutch type LSD.

Here's a typical company blurb :

"Castrol LSX 90 is primarily recommended for use in the limited slip
differentials fitted to a wide range of Australian, American, Japanese,
British and European vehicles. Castrol LSX 90 is also recommended
for certain tractor and construction equipment axles and final drives
that use “wet brakes” and extreme pressure gear oils. Castrol LSX 90
gives added wear protection in both conventional and limited slip
differentials. (See current Castrol Lube Index). It is also suitable for use
in conventional hypoid type differentials."

NO MENTION OF WHAT TYPE OF LSD.

What am I missing here besides brains?

[ar4me]

Not sure if you are looking for specific oil suggetions... but... a preferred transaxle oil here for both street and race boxes with LSD is Redline 75/90NS, as is. There are probably others, but this one seems to do the job.
Jes

[Micke]

Funny enough you specify the one RedLine which is NOT ment for LSD without friction modifier.

[ar4me]

Funny indeed. Just proves that you cannot rely on the manufacturers info blindly - 75/90NS is the one to use for OUR transaxles with LSD, as is, without any modifiers. This is an example of the problem MD was getting at, I think.
Jes

[Mats]

What do you mean? You have done lab testing to prove Redline wrong?
Why do you think it's working? Or rather, how do you know it's working?

[ar4me]

Mats, each to his own. I will note that you and Micke believe 75/90NS, as is, is NOT correct for our transaxles with LSD... though, don't say I didn't give you a heads up.
Jes

[Micke]

I also said it's not meant for LSD. LS stands for "non-slip".
However, it does work with LSD. On track it might even work really good. The clutch plates can "stick" to each other making some noise. But the LSD itself will work perfectly OK.

We use different mixes of RedLine in our two racing gearboxes.

http://www.redlineoil.com/products_gear ... tegoryID=6
"75W90 NS
This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials."
I don't know how it could be said any more clear than that.

[Mats]

Mats, each to his own. I will note that you and Micke believe 75/90NS, as is, is NOT correct for our transaxles with LSD... though, don't say I didn't give you a heads up.
Jes

I didn't say either way, I just asked how you were so certain if the manufacturer said otherwise.

Me myself use Pennzoil GL5 LS oil.

[Giuliettaevo2]

Yeah Mats trying hard to see the light.....

Sorry Micke but I looked up all the oil companies you mentioned (and more) but come up dry. Nobody specifically endorsed the oil for a transaxle with clutch type LSD.

Here's a typical company blurb :

"Castrol LSX 90 is primarily recommended for use in the limited slip
differentials fitted to a wide range of Australian, American, Japanese,
British and European vehicles. Castrol LSX 90 is also recommended
for certain tractor and construction equipment axles and final drives
that use “wet brakes” and extreme pressure gear oils. Castrol LSX 90
gives added wear protection in both conventional and limited slip
differentials. (See current Castrol Lube Index). It is also suitable for use
in conventional hypoid type differentials."

NO MENTION OF WHAT TYPE OF LSD.

What am I missing here besides brains?

"wet brakes"

if the oil can be used in this application that means it won't affect the friction of the clutch plates. at least that's what i think...

[Mats]

It will bring the breakaway friction closer to the dynamic friction, this will (hopefully) eliminate noise and harshness, i.e. sticktion.

[MD]

Finally we are getting down to the level of discussion I was hoping to do from the start which is to arrive at a good solution not only for Kevin but for all of us involved with these cars whether for racing or otherwise.
As you can see once you start delving into the information from the oil companies that there are wrong and contradictory claims being made all the time.
Anyhow, I dont want to bore everybody shitless about this so I will keep up with my research and post whatever finally comes out of the wash that has some substance behind it and verififies once and for all that it is a suitable fluid.

...so far I remain unconvinced and my flashlight is burning dimmer in the dark

[ar4me]

The clutch plates can "stick" to each other making some noise.

Have never noticed any noise with 75/90NS - track or street.

I think that one concern from adding the LSD friction modifiers or use the (75/90 which has the LSD friction modifiers) is that this may be generic instructions for diffs in general, without considering the weak Alfa syncros that share the oil in our transaxles. The friction modifiers are not great for the weak Alfa syncros, or as Redline hints at it: "75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization." Or, as they say under 75/90NS "This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting." As Micke said, they do say 75/90NS will basically increase lock-up, and do not say it cannot be used with LSD. So, given the weak Alfa syncros I don't think it is strange that shops and individuals use 75/90NS on both street and race LSD transaxles.

Jes

[Mats]

Or, as they say under 75/90NS "This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials.

Read= This oil is not to be used for Hypoid gears, it will not work.

Has absolutely nothing to do with the LSD in this case but the rather special demands on the oil due to the hypoid gearset. A normal gearbox oil (FWD transaxle oil for instance) only have cylindrical gears and can run in almost any type of oil, Dextron/ATF for instance. This will destroy a hypoid gearset in a hurry.

[Micke]

Are you mixing friction modifiers with EP additives?