Right now I can get M1 EP 0w20 for $23 on Amazon, I have 5 quarts of TGMO 0w20 that I was planning on using. I was thinking since the M1 is on sale and I could get it at a decent price that I could run it for the summer fill as it has a high percentage of PAO and might stand up to the summer heat better, then I could use the TGMO for the fall/winter fill. Is this a good idea or would you just stick with the TGMO that I already have in stock. OCI would be 5,000 miles or MM which would work out to about 7 months. Driving style is severe, most trips being 1-5 miles in length. What would you do? Thanks in advance BITOG!