Originally Posted by
JFB Tech
MT75 gearboxes don't like 75W 90 oil. Originally Ford had their own specific MT75 oil, the colour and consistency of ATF. I put Ford 75W 90 oil im one of mine once as that what was what the dealer told me they now recommended as they stopped doing MT75 oil. It was horrible and notchy and slow to engage gears. I immediately dropped it out and put Comma MT75 oil in and it was fine. Granville also do an MT75 oil.
ah bugger so good chance then I’ve totally destroyed the gearbox as a result?
I can’t seem to get either brands you mentioned over here in Munich and the AUTODOC website where I got the 75W stated it was replacement for the original Ford spec. That could make total sense as it was only after I had changed the oil that the rumbling grinding sounds began. So in most cases it’s probably destroyed the needle bearings or the likes inside the box. And early today I bought another MT75 north of Nuremberg that I need to collect later this week thinking I’d need to change the gearbox out.
Oh well!