I have blown a bunch up using the following

Cheap coastal synthetic 75w90 - stock diff with stock motor.
mobil 1 75w140 - another stock diff with stock motor
amsoil 75w140 4.77 rear end with 230hp 2.2 liter motor
amsoil 75w90 stock diff with 230hp motor

I quit using stock diffs.

 

WOW ... you drive it like you stole it !

 

May be off topic of how it failed...as mine has not. Mobil 1 75W-90 since her virgin oil change at 5K. Many years ago Honda was very open with an author;Dan Carney. His book on the car is a collectors item now costing a bunch. Honda missed their target market with the "S" which were males over the age of 50 with 6 figure incomes. Unfortunately the B16 crowd upgraded and the problems started (I.e. "glass rear end" from 9 K clutch dumps). The book is a great historical read on the history of the car and why the car was "updated-LOL). If you use a proper Grade lubricant and don't drop you are fine. If you drop, lubrication won't save you......Normally aspirated or otherwise. You need to build the diff...Puddydadcomes to mind.
Utah

 

I noticed Billman specifies Mobil 1 75W-90 as part of his "Once Over" package for the diff.

Me too. I don't dump. Seems like all the really good drivers (not me) are very, very smooth and the speed of shifting and clutch dumping is not the reason they go through the track faster.

 

When or if you finally get to the track, you'll find this to be very true. The jerky, erratic drivers will get out of the way for you too as they head for the weeds!

 

Thanks for your input wadzii! Perfect!

 

These diff's break when you get traction.. Dump the clutch and blow the tires off they won't break. a nice fast launch where the car hooks and goes will break it every time.

 

Define 'track'. If Track to you means a straightaway with a christmas tree at one end, then you are much more likely to use terms like 'glass differential'.

 

The road course is probably the last place you'll bust a diff.

 

I see more failures being added to the list. But I don't see the participants telling us what viscosity they used. Any ideas why not? This is starting to baffle me.