This past weekend I was at a shop getting my CV joints swapped. I also got my diff fluid changed out and they had recommended using Redline MT90 for my diff (I have a stock 2004).

Is this right? I've been doing a lot of research and see people recommend the Redline 75w90 but can't seem to get a straight answer on Redline MT90 which is also 75w90.

Can someone please help clarify this... did I get the wrong oil put in? Is this an acceptable oil?

thnx...

 

I would stick with OE Honda fluids but you can always switch back...

 

I need to know specifically about what I got put in "Redline MT90"...thnx

 

Unfortunately, there is no OE Honda diff oil. If a dealer sells you Honda diff oil, never go back to that dealer again because they just sold you CR-V diff oil, which will ruin an s2k diff.

Thomas...hopefully SpitfireS will chime in on the MT90. I know that it is a transmission oil that is 75-W90, but I'm not sure if the friction modifiers used for syncros would harm the torsen LSD.

 

MT90 is a fine transmission lube but is not recommended for a diff. Redline sells a 75w90 gear oil that is better suited for the diff.

 

Sorry I meant Mobil 1, the local S2k guru on the Metro section uses them for all diff. changes....

 

The Mobil 1 75W90 LS that most parts stores carry would be well suited for colder temps since it has a viscosity of 106 cSt at 40 deg C and 15.2 cSt at 100 deg C. So at -10 deg C, imagine how thick that stuff would be! Its viscosity would probably be close to a 80W140 in the summer, which for Redline 80W140 is 231 cSt at 40 deg C and 26 cSt at 100 deg C.

Redline Viscosity Comparison

Mobil 1 75W90 LS Info

That's why I'm using 75W90 right now. Once it gets into the 50's I'll switch to 80W140 or a straight 110 weight since single weight fluids don't shear down as quickly.

 

negcamber Posted on Jan 28 2009, 12:55 AM
There's always the Honda Marine SAE 90 GL-5 fluid.
Exactly what the manual specs.

Anyways..
Redline MT-90 = GL-4 = don't use it IMO.
S2k diff needs a GL-5.

SoCalIsMyLife Posted on Jan 28 2009, 04:57 PM
And IMO that is exactly why Honda specs a single weight SAE 90 for the S2000 diff.
A relatively small 7" ring & pinion, small (light) housing that holds less than a quart of gear oil with a 240HP engine in front of it......

Personally I would rather use a single weight oil and take it slow when the car is cold than use a multi weight oil with the same end viscosity because it has a lower pour point.
Arctic use of single weight dino gear oil is out... obviously.
IMO single weight + 1 weight = multi weight.
SAE 90 = 75W-110
IMHO

Right now I'm using Amsoil SAE 190 in my 4.57 diff.
Pour point of -30C (that's low enough for me).