I am wanting to change the transmission fluid on my Tacoma.
(2009 Extracab 2.7L 4WD 5 speed manual)
Toyota recommends either GL4 or GL5. However, dealers only have GL5 fluid in stock and are clueless of the whole thing. Some have told me that this is an aftermarket idea and OEM is just 75W90, no GL4 of GL5.
Historically, it has been known that GL5, while providing greater ferrous gear protection, can damage brass components in synchronous transmissions.
I understand Toyota in the past has had a good reputation for reliability, but I wonder why they are allowing GL5 here. It could be that the average vehicle owner puts 10,000 miles/year on a vehicle, at this rate the powertrain will outlast the chassis, and it is easier for them to just tell the "techs" to use one fluid in both transfer case and transmission.
Does anyone have a solid answer from Toyota on this, other than "Toyota recommends this fluid."
Do you have a second generation Tacoma with R155f transmission and 200,000+ miles on it that you used GL5 fluid with?