Per my last thread, I got some good answers but I would like to ask in a different direction: this time with picking appropriate gear oil viscosity. My vehicle is an Isuzu dmax (diesel powered with 130kw and 380nm of torque) with a 5-speed manual synchromesh transmission.
The book specifies a 5w30 besco transaxle fluid (no available data sheet, but being a 30 weight i presume its KV100 10~12Cst) or 15w40 (14-15Cst) engine oil. Currently I am running Amsoil Synchromesh fluid 5w30 with a 10.1 Cst. Ran like a dream with Amsoil MTL for 4 years / 63k kilometers until recently when it started shifting notchy both cold and when warmed up.
Would a 75w80 gl-4 with 7-8 Cst be enough to protect my manual transmission considering its a light diesel truck that's occasionally used for hauling boxes? Or should i stick to a 75w85 since it falls between a 30 and 40 weight engine oil (that's specified by the book).
If a 80 weight won't cut it I would probably use the same engine oil I use in my engine--Zic 10w30 CI-4 which is a stout full saps diesel oil with 10.9 Cst.
I am in a tropical region if it matters, no freezing temperatures. warm 25C-37C temperatures all year round.
The book specifies a 5w30 besco transaxle fluid (no available data sheet, but being a 30 weight i presume its KV100 10~12Cst) or 15w40 (14-15Cst) engine oil. Currently I am running Amsoil Synchromesh fluid 5w30 with a 10.1 Cst. Ran like a dream with Amsoil MTL for 4 years / 63k kilometers until recently when it started shifting notchy both cold and when warmed up.
Would a 75w80 gl-4 with 7-8 Cst be enough to protect my manual transmission considering its a light diesel truck that's occasionally used for hauling boxes? Or should i stick to a 75w85 since it falls between a 30 and 40 weight engine oil (that's specified by the book).
If a 80 weight won't cut it I would probably use the same engine oil I use in my engine--Zic 10w30 CI-4 which is a stout full saps diesel oil with 10.9 Cst.
I am in a tropical region if it matters, no freezing temperatures. warm 25C-37C temperatures all year round.