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sinubok kong magpalit ng transmission oil. SAE40 as stated in the manual. medyo nabawasan yung hummming noise pero meron pa rin specially when slowing down using engine brake. I also found out na masyado madami naikarga ko the last time I changed the oil in the tranny. medyo maiitim na rin yung oil after more than 25,000 km. sa susunod, differential oil naman.