Couple of Gearbox Questions

[Terrytuned]

The best oil for 3and 4spd g/boxes we have found is 75/90 GL4 semi synthetic, for race boxes use the MT 90 fully synthetic as they get very hot, the price has no doubt increased since as this is an old photo. this is a light gear oil so about the same viscosity as SAE 30 but with all the properties of a gear oil. For engines I use Halfords 15/40 semi synthetic at  5ltrs for £20 very reasonable, for race engines Valvoline 20/50 race oil is very good as it has a stable viscosity at high temperatures.
      
Terry.