I recently happened upon some M0502 batch GC at Canadian Tire here in Nova Scotia. My car has a 4.2L oil change with filter, but 4.7L dry sump. Would this little left over 0W40 with only 5000km on it be of any concern to me in the switch to GC. I found the 0W40 to be a bit too thick at high RPMs. I'm thinking GC being 12.2 vs 14.3 would flow better. Am I wrong? Or should I just break down and buy my usual M1 10W30 for summer use?