Hi, sorry if it's been asked before but can someone tell me the best oil to use for a gearbox oil change on a DT 125RE. Thanks.

My choice is always Rock oil Guardian.

As drty says " gardian is good, Sikolene MX gear oil, too , As long as its not Car engine oil, as it has anti-friction agents added, and will cause clutch slip ,

Anything for motorcycles. It hardly overstressed in there.

Never put anything fancy in the dt and thats had some right greif over the years.

Thanks for the replies will get some Rock oil Guardian.

10w40 or 10w30 invade you meant what viscosity