Beast I have had the amsoil sig series 0w30 in my 12 gt for just about a year and 10,000 miles now. The oil has seen freezing 20 degree days all the way up to Humid 100 degree days. I'm not one of those guys who drives like an old lady either my car sees plenty of wot blasts and I recently went to the drag strip for the first time and ran about a dozen passes my best time was a 12.85 @ 114 with a bama 93 race tune. My 60ft was weak and the car has a lot left in it. Any way I'm getting ready to change the oil next week and I do not plan on driving the car through another michigan winter it will be stored in my garage, so my question for you is should I stick with the sig series 0w30 or go with the 5w or maybe even 10w now that the car is not going to be running in freezing temps anymore. The summer's here get pretty hot and humid and like I said I'm not easy on her. Oh yeah and I will definitely be sending in the old oil for analysis to black stone. Thanks in advance.
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