I went to the Nissan dealer yesterday for my free oil change that they promised. I brought some MT-90 there and asked if they could install it in the transmission while they had the car up and they said it would void my warranty because the 6 MT takes 75-140 and the MT 90 is a 75-90. I told him that the manual says 75-85 or 75-90 but he wouldn't believe me and I got tired of arguing with him and told them to forget changing the tranny fluid.

That just reinforces why I won't take my car to the dealer unless I need something seriously repaired under warranty or out-right replaced. Redline makes 75-140 products as well. The question is which to use? The manual doesn't say anything about 75-140.

In any event, if I put it in myself they'll never know what it is when they drain it :).

i believe semtex has replaced both im suprise he has not replied yet

use either a 75-85 or 75-90 GL-4 like the manual says. The tech I talked to was plain wrong. Even if he is correct that a 75-140 would work, he wasn't correct that my MT-90 was the wrong fluid.

Also, I didn't don't mean to go off topic of the original thread on trans oil, but since you mention the dealer, they also put in regular motor oil instead of the Ester I requested during the service.

I was watching the Nissan tech pump in the oil from a distance and saw he was using the oil gun from the bulk oil supply (huge drum of oil hanging from ceiling). I told one of the service managers that I suspected the oil drum didn't contain the Ester based motor oil. She then said that it did and that he simply presses a button on the gun to switch between Ester, Regular oil, synthetic, and syntec blends. I told her I didn't want to make a big fuss but I highly doubted that an almost $20/quart oil would be sold in that large of a drum. She rudely stormed off to the garage so as to prove me wrong only to learn that I was right. She came back and told another service advisor to tell me that they were going to drain it out and put in the Ester... The tech that did the oil change is a different person from the tech who told me that Redline MT-90 for my 6MT gearbox would void my warranty btw.. just shows that sometimes the incompetence isn't isolated and is spread across their techs.

9 years ago, when I was a Junior in High School, I used to work at a oil change shop and some techs just assume way too much without looking into the manuals to make sure they have their facts straight. Doing everything yourself if you have the know how is definitely the way to go.

isn't there some question now about changing your own oil and Nissan using that against people saying that there is no way to prove your oil change procedures essentially voiding your warranty?

Its some bullsh1t times we live in.

I would argue that its only true if you somehow mess it up and they can prove it led to some specific failure. I don't think doing your own oil change could void your warranty esp when the owners manual has DIY instructions ie, implying that its not required for the dealer to do it for you.

any updates on the DIY? :)

I may tackle it Sunday morning. I'll see if I can put together a diy for both the diff and tranny

that would be awesome im planning to change mine at 7000mi on my next oil change