Hey Tony,

I have been using standard 0-50w syn engine oil for my gear boxes(tamiya and reductions too). What I did was run the gears in with tooth paste for 1 hour. And wash all the tooth paste with 5-50w syn oil. All the tanks I have been using is just pure 5-50w Mobile one syn. I mean any motor oil will do the job. So far its my 4 years..these tanks never let me down....