Many threads about what oil to use where already around... The conclusion was, more or less.... 1) semi synthetics are a rip off (very low of "synthetic" inside, double price) 2) for low performance engines, dino oil will be alright as well, change it more often. 3) many people use fully synthetic diesel oils in their bikes. When you look a bit through the forums, there are a lot of different opinions. Some say you can blend whatever you want. Others say you have to stick to the same brand. Stick to the same viscosity. Don't mix more than 25% synthetic, otherwise it'll start to foam... Did anyone had in mind to blend his own oil???