JAB

1999 AWD RX300, 215K. My rear differential is quite moist with what appears to be a leaking lubricant. Can't tell where it is coming from, but appears to be from high up on the housing. Anyone with similar experience?

hypervish

Check the breather.

Also, check the fill plug. Mine leaked from the fill plug after changing the fluid. Replaced the plug and all is well.

JAB

Good call; almost certainly the fill plug. Any idea what size allen wrench is required to get it out?

carguy07

10mm get a new crush washer too Part # 12157-10010

JAB

Will be changing the fill plug and crush washer today. What is the spec for the rear diff gear lube? TIA

hypervish

Go with Amsoil. I wish I had.

I went with Royal Purple, but since then having looked at many studies on gear oil. Royal Purple was near last in almost all cases. Amsoil was the leader in most, if not all scenarios. And, Amsoil is cheaper than what I paid for Royal Purple just getting it is a bit tougher.

thomas1

funny I have for years wanted to switch everything to Amsoil, just cant seem to get off the dime and do it. I even thought distributing it among family to make it worthwhile. They do list dealer within your area though.

JAB

What I was really looking for was viscosity. Checked the owners manual and it says API Gl-5, 80W-90.

thomas1

Yes that is a good weight.

salimshah

You may already know this ....
Undo the filler plug, before you touch the drain plug.

Salim

hypervish

It will be hard to find 80w-90, 75W-90 is a good substitute (many members here use that weight).

JAB

Thanks folks.