Help With Lubrication

[crackerbme]

Hey guys, I need some info on oil for my transmission and differential. I have an '89 325I and I have fully rebuilt the 5 speed transmission with new bearings and sycros and the LSD differential with all new clutch plates, dog ears and ramps, and I am having a difficult time selecting the fluids for them. Should I use fully synthetic or not? What would be the weights of the oils that I should use? I have read that one person used Redline synthetic and it ate up his syncros, is that even possible?? I have 6 new sycros in there at a hefty price so obviously I don't want that to happen. Any help or information will be a big help. Thank you.

[flyboyx]

Red line fluid did not chew up someone's syncronizers. They are passing blame off of their own sub par workmanship.

Do you have a bently service manual? This book is the maintenance bible for the e30. It will tell you the correct viscosities for every location on your car. I would personally use only synthetic fluids in my car. Shell and mobile make great products. I would personally avoid bullshit botique companies like royal purple that charge about double for the pretty color. I dont have any experience with red line, but i would choose products from the ones i mentioned above.

Welcome to the forum.

[jeffnhiscars]

The risk to synchros is not connected to synthetic vs Dino but rather the additives. As long as you stick w GL4 you should be fine. It's the GL5 that eats synchros (& small children).

I use redline MTL in the trans and redline 75-90 in the diff (you'll want the lsd version of course). Assuming you're in the St Albert in Alberta both of those should be thin enough for winter.

[UNHCLL]

https://www.redlineoil.com/application.aspx

Gearbox - Redline MTL
Differential - Redline 75W90 GL5

[Digitalwave]

https://www.redlineoil.com/application.aspx

Gearbox - Redline MTL
Differential - Redline 75W90 GL5

This.

[YosemiteSam]

https://www.redlineoil.com/application.aspx

Gearbox - Redline MTL
Differential - Redline 75W90 GL5

This.

Those two guys.

[jeffnhiscars]

There's an echo in here

[parkerbink]

One of the several threads like this ought to be a sticky.

[roguetoaster]

One of the several threads like this ought to be a sticky.

But not this one, as not one member here turned the thread in to a sophomoric sex joke.

[TobyB]

Sticky

Better?

t

[dnguyen1963]

But not this one, as not one member here turned the thread in to a sophomoric sex joke.

I was just thinking about a different lubrication. How about that?

[Joe G]

I'm here for the gang bang, brought my own lube too.

[roguetoaster]

Why are you banging gears? Use the clutch or r3v match next time.