:small3d029:elaoIm getting ready to do an oil change and filter change and primary change. I have done one oil change earlier this year and put just regular H-D recommended oil and primary oil in. I have noticed a strong smell of gas in my oil tank and it worries me. Im gonna just change all of it. I have heard good and real bad things about all types. From personal experience what would be good to use? In my car I run nothing but full synthetic and a big supporter of it. I dont know if its any different with motorcycles or not. Also, what brand should I use also and weight? Thanks a lot!