Does anyone know what type of fuel is best to use while running an MDS engine? Such as the nitro content or the oil percentage.

MDS engines like low to no nitro fuel. I don't have a MDS engine but it is my understanding from owners on various Internet forums that MDS engines aren't designed for much nitro. Good Luck!

If you read your owners manual of the mds, it states ,use high quality fuel with 5 to 15 % nitro, i use 25 % in all 4 of my mds's , never had a single problem on any, even my heli engine, my mds .68 has over 23 gallons thru it now on my midget mustang.