Gearbox oil

Rover PG1

The service manual says your Rover PG1 gearbox id filled for life, and requires no periodic renewal. However, some people choose to replace the oil in sync with their C service. Some have commented that a better oil can improve gear change and reduce noise.

PG1 needs API GL4 spec for the synchros.

Dry fill capacity = 2.4 litres, Refil = 2.1 litres

Makes

• Texaco MTF94 (OEM)
• Lodexol MTF GL4 75W80 is PG1 specific direct replacement for MTF94
• Castrol TAF-X
• Castrol SMX-S
• Motul Gear 300
• Silkolene Syn 5 75w-90
• Unipart GUL2622
• MPM 18000HR - GEARBOX OIL HONDA ROVER (75W-90)

You can get MTF94 from Land Rover (part no STC9158 for 1L, part no STC 9157 for 5L) or online here: [1]

Honda M6T

The Honda gearbox is also normally considered filled for life, but the OEM gearbox oil is quite thin and some people change it for a more viscous gearbox oil to cope with high temperatures (eg. heavy track use) better.

Dry fill capacity = 1.7 litres, Refil = 1.5 litres

Makes

• Honda OEM MTF-III part number 08798-9031
• Silkolene Syn 5 75w-90