highest quality 75w90 gear oil, that can be bought

[GiveMeAVowel]

Originally Posted By: MolaKule
Is the application for a differential or an MT?


As usual MolaKule points out an extremely important difference between applications.

 

[MetalSlug]

its for diff

 

[MolaKule]

Amsoil SevereGear 75W110 or Valvoline Syn 75w90 or Redline 75W110 are all excellent GL-5 differential lubes.

 

[MolaKule]

Originally Posted By: Rand
Originally Posted By: UltrafanUK
Liqui Moly are the dogs small round things in gearbox and engine oil. I use their 75w90 box oil and the shift quality is so go it jumps into gear with no noise even before I have touched the clutch pedal. One tube of extra Moly additive did help a bit! Might not be in your local store but Fleabay are good.

Castrol Synthrax is not good in older boxes due to yellow metals corrosion risk. 75w80 is a fraction thinner in winter (It's a curve thing).
Shell or Mobil if you can't find the real McCoy oil.

ALWAYS CHECK THE OIL FINDER PAGE, as it might list OEM dealer only for some boxes.


are you seriously recommending api gl-5 gear oil and moly additive for a regular manual transmission?

A moly additive is not good for a MT as it competes with the friction modifier in a dedicated MTL.

The OP is discussing GL-5 differential lubricants.

 

[dailydriver]

Originally Posted By: Popsy
I'd say Motul Gear300.


+1, and it can now be ordered from Summit Racing as well.

 

[Powerstroke]

Originally Posted By: Donald
Amsoil SVG gear oil


This. Without question