Transmission Flush - 986 Forum - The Community for Porsche Boxster & Cayman Owners

chitowndad · 11-09-2008, 01:33 PM

So the Redline 75W90 NS is a GL5 and the 75W90 MT is a GL4 oil. How big of a difference is the GL4 verses GL5?

-Steve

chitowndad · 11-09-2008, 01:37 PM

Thanks for the offer Lil Bastard but it just means I don't tell the wife and I don't buy lotto tickets one week! LOL

) I may put it on ebay, some day...

-Steve

Cloudsurfer · 11-09-2008, 02:20 PM

My understanding is that GL4 is not so good for gearboxes with yellow metal in them. I am not sure if the Box S does or does not, but I have been running 75W90NS in mine with great success.

I don't think any fluid will make these boxes shift like butter when cold, but I certainly don't think its any worse than stock with the 75W90NS and I'm inclined to think its a better lubricant than the OEM stuff.

Kirk · 11-09-2008, 05:53 PM

Quote:

Originally Posted by chitowndad

Thanks for the offer Lil Bastard but it just means I don't tell the wife and I don't buy lotto tickets one week! LOL

) I may put it on ebay, some day...

-Steve

Eh... just throw it in your toolbox. You'll probably need it someday for a different car or a friend's car. It's not like the tool is going to go bad or anything. I've got lots of tools that I barely use, but then the one time you need it... well you need it!

Kirk