I picked up the last 2 quarts of redline 5w30 for 3.73$ each on clearance at canadian tire. Sump takes 4 quarts on a change, and I cant find any other bottles of redline anywhere...so im thinking what should I mix it with? I have a jug of 5w20 PU but id likely want to use the PU all in one change..so any thoughts as to what would be the ideal oil to use it with?