With all the discussion on gear oil ,I have read most if not all ,why has nobody suggested PJ1 90w gear oil this would see to be the only correct substitute
meets OEM specs . anyone have thoughts on this .

PJ1 HYPOID 90W GEAR OIL APPLICATION AND PERFORMANCE:

• PJ1 Drive Shaft Hypoid Gear Oil SAE 90W exceeds API GL-4, GL-5.
• Use where SAE hypoid gear oil is specified.
• TYPICAL PROPERTIES: Gravity API @ 60 F: >31
  Gravity water = 1 .87 to .93
  Density air = 1: >1
  Flash Point: 311-468 C (592-875 F)
  Storage Stability: Excellent
  Color: Amber
  Viscosity ASTM D 445
  Grade SAE 90
  CST @ 100 F: 140.
  CST @ 210 F: 14. to 15.
  Warning: This product contains a chemical(s) known to the State of California to cause cancer

 

PJ1 Drive Shaft Hypoid Gear Oil SAE 90W is designed for use in motorcycle drive shaft applications. (according to their website) Probably only a few of us have bikes with drive shafts and consequently haven't heard of it. It's SAE 90/GL5 spec meaning is should be good. Let us know how it works.

-- Chuck

 

 

I've used mobil 1, valvoline, LE607 and 1605, amsoil 75w110 and 75w140.

the CLEANEST my magnetic drain plug has ever been by far is with Amsoil 190.

go BIG.

 

while changing out my trans and diff fluids yesterday I noticed that a lot of fluid gushed out of the FILL hole of the diff...does this mean it was over full?

Kind of a similar thing happened to the trans too - a lot of fluid came out of the fill hole. The change eventually went well and I'm now running high quality Motul Gear 300 GL4/5 100% synth oil in the trans and Liqui Moly 85W90 (mineral) GL5 with LS additives for the diff. Not sure what was in there before but both fluids looked pretty dark as they were draining. No bits, no pieces from either side Only a small amount of particles were on the magnetic drain plug of the diff.

 

Was the car level when you drained the oil? If so then it probably was overfilled.

 

It was on a shop lift so yeah perfectly level. I wonder who over filled it and why?!

 

The gearbox was overfilled or the oil is breeding in there like rabbits.

There is some thermal expansion of engine oil when heated but in the quantities involved is inconsequential.

In the engine the 5 quarts of oil filled at 70°F will have a volume at operating temperature of 212°F of about 5 quarts + 2 ounces. In the gearbox, which holds less than a half gallon and doesn't get as hot, the oil increase in volume is less than 1/2 ounce at an arbitrary 150°F if also filled when it was 70°F. Same with the differential which holds less than a quart. Not enough to come "gushing out" the fill hole.

-- Chuck

.

 

So they were both actually over filled then... ah well, nothing bad happened and now I know that both the trans and diff were filled to the proper capacity
On track yesterday they both felt awesome let alone the whole machine! t'was great.

 

car probably was not level when previously filled, so they probably overfilled it that way. i see no other possible way to overfill through a level fill hole.