I think the theory behind nitrogen is air temp. has less effect on nitrogen. We know when it cold (Not Florida Cold, but real cold) air pressure is reduced and when it hot Not Florida hot but Midwest or Az. summer hot. air pressure increases along with heat build up in the tire. With nitrogen there is no moisture and temps. in theory has less effect. How much less??? If my tire was low it wouldn't bother me abit to put regular air in them... They also in theory say the tires don't deteriorate as fast with nitrogen. I'm still on the fence about nitrogen filled tires, about to fall of on the non-sence side...
yes 0w-20 to 50 is syn. oil. which is about $7+ bucks quart the last time I brought some. For some that may not know the 0 in the oil number means it's will be thin in cold temps. the 20 to 50 number means it will be thicker when it's hot. So on cold morning in Mi. say -25 the oil will be thinner so it will get to the bearings quicker...If it had straight 20w or hopefully not 30W the oil would be like honey and not flow to the bearing quickly or may not even build up pressure quickly i the extreme cold. about 60 years ago muli-grade oils made it so you didn't have to change you oil just because it getting real cold or real hot. 0-20 syn is the best forumlated oil devoloped.
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