AMSOIL SEVERE GEAR 190
AMSOIL Severe Gear Synthetic SAE 190 and SAE 250 Gear Lubricants are intended for severe racing and other applications where extended drain intervals are not beneficial.
I would use the 75w110 or 85w140 if I were you. That oil is for drag racing differentials where it gets changed out all the time.
http://www.amsoil.com/StoreFront/srn.aspx
APPLICATIONS
AMSOIL Severe Gear Synthetic SAE 190 and SAE 250 Gear Lubricants are excellent for severe differential applications, including off-road truck racing, rock racing, rock crawling, tractor pulling, funny car racing and dragster racing. Other severe duty applications include heavy duty trucks and equipment where increased lubricant film is necessary. These oils are recommended for use in hypoid gear differentials and other applications requiring a high viscosity, API GL-5 gear lube. Where limited slip performance is required, use AMSOIL Slip-LockÂŽ limited slip additive.
Service Life
AMSOIL Severe Gear Synthetic SAE 190 and SAE 250 Gear Lubricants are intended for severe racing and other applications where extended drain intervals are not beneficial. AMSOIL recommends changing the lubricant as conditions dictate. Where extended drain intervals are desired, AMSOIL recommends monitoring by oil analysis.
I also runAmsoil MCV 20w 50 synthetic motor oil in my motor. Its costs more, but in the long run it will be the best way to go
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where did you read that ? know alot of people are using redline and its the same weight




