Manufacture recommends 5w30 dino oil for year round use. My dealer uses Mobil 5w30 drive clean that has a cold weather pour point of -38 C degrees. I want to use Mobil 1 10w30 that per Mobil has a cold weather pour point of -45 C degrees. My question is, could the manufacture refuse coverage on a lube warranty claim if I use the Mobil 1 10w30 year round since they recommend 5w30 for temps under "0" degrees F? Would this fact that the pour point is lower on the Mobil 1 10w30 cover me?? Thanks