ok guys i got a 6 pack case of 5w-30 pennzoil platinum synthetic on sale at advance auto and i will be doing an oil change in the not too distant future. since i only do 5k ocis i didn't want to waste the oil so I was thinking of using 2 quarts of the platinum with 1.5 quarts of 5w-20 pennzoil dino in my 3.5 quart sump. my car is a 04 civic. if i didn't do so much stop and go driving i probably could do the normal 10k ocis but just to stay safe i'm going to follow the severe service schedule. also the next time i change my oil after this one will be 15k so i was thinking of doing a uoa on the oil and possibly a dyson analysis. would it be ideal to do this mix for the uoa since that will be my regimen for a few ocis if it works? or should i do the oci with one oil or the other? what do you guys think? also i will be adding lube control to the oil. thanks in advance.