I'm sure ya'll have done the oil thing a dozen times, but I'm new to the forum as well as to my '90 Honda XR600R. I ride it HARD on the street. As in high revving, compression braking, canyon twisty road style. I live in So-Cal and right now the typical riding day is about 55-75 degrees. My questions are: 1) What type of oil should I use, Full Synth, Semi-Synth or Plain? 2) What weight is good to use? 3) Do you care if you use car oil or specific 4 stroke oil? 4) Why are there two different spots on my bike to drain the oil (one below the shift lever the other on the front of the frame). THANKS! <rookie questions, hahah> ps. what I've been using is 20-50 Semi-Synth Quaker State automotive oil.