Synthetic oil in 5 speed

[exist3nce]

I don't have the exact same transmission, but my D20 is very close to your D16. I started using Motul Gear 300 and its great. It shifts a bit rough when its cold, but as soon as it warms everything is perfect. Been running it for about 20,000km.

[AlaskaNorth1]

I might offer a suggestion to the steps above:

Remove plug#2 to ensure you're able to get it out without any problems prior to draining the tranny.
Then remove plug 1 in diagram to drain it.
Then put in plug 1 back in.
Fill tranny until fluid is level with the plug hole, and begins to come out of hole.
Replace plug 2

I had a truck I changed the differential on and pulled plus #1 first, drained it, and then found plug #2 was seized...rather difficult to get it to the dealer that way. I ended up having it towed as I simply couldn't get it out. They replaced the diff but not until I had paid the tow bill.

[dleebold]

found these pics on my hard drive,hope they help.

[Ratchet104]

I was wondering the same thing. The book says 75w-80 gear oil but I have like 6qts of 75w-90 laying around....I know the weights not gonna cause a problem but I'm not sure if going to synthetic from nonsynthetic is gonna cause a problem. Not gonna lie, I'm not too knowledgeable about gear oil.

[petrified.rabbit]

i probably would not go from synthetic factory to non-synthetic..

but how many miles are you guys that you are changing the oil?

[Ratchet104]

Factory is nonsynthetic (75w-80) I just happen to have like 6 qts of GM synthetic gear oil (75w-90)laying around so I figure why not put it to use

[GeckoMan1]

First thing I did to mine @ 200 miles. Shiffing was much better. No hard shifts 1 to 2 and 2 to 3. I used Royal Purple. Kind of expensive @ 20 bucks a pint. Just like my oil change @ 500 miles, the old oil was full of metal. This engine and drivetrain is put together like American iron from the 1980s.

[Ratchet104]

First thing I did to mine @ 200 miles. Shiffing was much better. No hard shifts 1 to 2 and 2 to 3. I used Royal Purple. Kind of expensive @ 20 bucks a pint. Just like my oil change @ 500 miles, the old oil was full of metal. This engine and drivetrain is put together like American iron from the 1980s.

Sooo what weight do you use? 75W-80 or 75W-90?

[GeckoMan1]

Royal Purple Gear Oil

Its 75-90. Also a correction, it was 20 bucks a quart. Worth every penny!

[GeckoMan1]

The manual for my 2009 says Gm #89021806. 75-90. What is GM 89021806 MT Fluid? (for their Aisin 5 speeds) - Bob Is The Oil Guy