Hi Scotty I have a 2003 Toyota Corolla with exactly 32000 miles on it since new we've owned it since new and it's time for the manual transmission fluid to be drained in changed however the owner's manual is ambiguous because it says I can use a 75w 90 in either gl4 or gl5, can you explain why this c59 transmission can take gl5 differential Lube? Thanks
I think it's because GL-5 is a higher specification. If it meets GL-5, then it meets GL-4
Mountain Man Joe that's a great thought but too many people I've been warning that most manual transmissions have brass in them and yellow parts that could be harmed by gl5 so I'm just wondering why would Toyota recommend GL5 that could harm such Transmissions if there were soft parts inside it?
I read somewhere modern manuals use steel and not brass. But I'm no expert.