you may want to look into a 15 50 or a 20 50 for those types of tempatures.
you may want to leave the oil in there a little longer. you dont want it coming out the same color it came in, you want it dirty. it coming out dirty means you're giving the oil time to do its job, helps clean everything out. im not saying leaving it in there until it smells like its been burning when you change the oil..but you need to give it some time. (imo)
__________________
|