manual gear oil

Autox MSP said:
mt90 is lighter weight then the 75w90. One is GL4 the other is GL5.
Red Line MT-90 is an SAE grade 75W-90 gear oil. The GL-4 or GL-5 rating has nothing to do with viscosity. According to the FSM, the MP3, P5 and sedans with M/T should use 75W-90 oil.

See: www.redlineoil.com

02 DX Millenium Red
 
Autox MSP said:
GL-5 provides exteme protection. Look it up.
Mazda clearly states in the FSM that either API service GL-4 or GL-5 can be used in the M/T, so the differential properties of either service classification are irrelevant for our cars. It further states that for all-season use, SAE grade 75W-90 is the correct gear box oil.

Case closed.

02 DX Millenium Red
 
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