Thanks for the clarifications

 

Thanks for your help everyone, i'll change the fluid out and report back.

 

As Patty (Kyras) mentioned above, I switched to the LE-1605 in my '06 S2000, and have had no problems with over 42k miles on the car now.

I had the original differential lube changed at Aliso Viejo Auto Service when the car had 13,500 miles. They used Mobil One 75W90 gear lube, and my car immediately started making rough, grinding noises during low speed tight turns. Not only could I hear it, I could feel it! I had the mechanic check the car, and he claimed he felt nothing. However, it was very noticeable to myself and Patty, and she had experience with the diffy going out in her '05.

After doing some research in the S2ki "Under the Hood" Forum, I found a write-up by "Road Rage" that recommended the LE-607 Almasol which was later replaced by the LE-1605. I ordered the LE-1605 from "Ricks2k," and had Aliso Viejo Auto Service replace the Mobil One 75W90 with the LE-1605. The diff immediately stopped making the rough, grinding noises, and has been smooth as silk ever since with continued use of the LE-1605. Unfortunately, they no longer carry the LE-1605 lube at Aliso Viejo Auto Service, so I supply it myself.

I know that some S owners have used Mobil One 75W90 successfully, but my car did not like it. I would agree that it is better to use a single viscosity lube in the differential rather than a multi-viscosity...especially in our SoCal climate. Once the car reaches proper operating temperature, I doubt there is any loss of hp.

Just my .02-worth.

 

^ i'm running the mobil 1 75w90 gear oil and it makes the same sounds and noises as being described (chatter-type noises). the factory fill did not produce these noises or sensations.

i've ordered up le1605 for my next fill for the differential and if this thread is still going, i'll report with my own observations and feedback.

 

^^ I think you will be very happy with the results of switching to the LE-1605 gear lube.

I just ordered a couple quarts from "Ricks2k" to have on hand. I hope he doesn't stop carrying it like "HardTopGuy" did.

 

I've never had any problems with Redline 75w/90 in my diff since 55k, and am now at 142k (not the same fluid, just the same brand at every change ).
I might just change to the le1605 next time I change it though.

 

There's a place that most of us SFV guys get their stuff.

They're in Van Nuys and the price is decent, maybe also save on shipping.

http://www.mag-hytec.com/oil.htm

of course it's always cool to support a sponsor too

report back with the results!

 

if you are worried about LE 1605 being an SAE 110 lube, take a look at this article.

http://www.lubrizol.com/DrivelineAdditives...ifications.html

SAE viscosity ratings were updated in 2005 because the old SAE 90 spec was too broad. SAE 110 has a higher minimum viscosity and a maximum viscosity that is equal to the old SAE 90 grade.

 

i changed out my redline with Motul 90PA last night guys....so far so good! i just hope i didn't cause any irreparable damage to my diff while driving around with the redline.

 

So? How's it sound now, when you do the slow turns?