I have a 01 Corolla with a 5 spd transmission and I would like to change the transmission oil, the owner´s manual calls for a 75w90 GL4 oil and I can only find a 80w90 GL4 and a 75w90 GL5, I have read that GL5 should not be used in transmissions that call for GL4 oil so my only option is 80w90.
Would it be safe to use this oil? The coldest ambient temp here is 68 °F BTW
Would it be safe to use this oil? The coldest ambient temp here is 68 °F BTW