GL4 or GL5

[Zoomer]

Hi guys I want to change my gearbox oil but don’t know the colour of the tag on the gearbox. So does anyone know what grade a manual 2003 3.0 would take please.

 

[MJJamieson]

GL4.

 

[Zoomer]

Thanks

 

[firebobby]

GL5 can eat certain metals in older gearboxes.

 

[andyf1140]

GL5 can eat certain metals in older gearboxes.

Yes it's the bronze in the synchros that it eats

 

[ph001]

..although, just to confuse matters, some of the GL5 fluids are also GL4 compatible like the Millers TRX 75W80... https://www.ebay.co.uk/itm/Millers-Oil-TRX-75w80-Fully-Synthetic-Manual-Gearbox-Oil-5ltr-/172512134690

 

[firebobby]

In an older box, I would put GL4 in, better safe than brassic