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Originally Posted by 2007 ion2
0 (cold "weight")W 30 (hot "weight"), the 0 is only under certain conditions, and when it warms up, 0W30, 5W30, 10W30, and straight 30 weight oil, all have the same properties (all other variables eliminated). I am a mechanic, went to a university for it and everything, most of the car driving public would believe as you do, but you are mistaken.
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0w30 was developed as a low(er) friction oil to reduce fuel consumption and for quicker lubing on engines built to ever tighter tolerances - especially when starting from cold.
I don't really qualify as
general public, I used to work for an oil (lube) company
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now I'm going to really upset everyone and tell them to stop running their tires at max sidewall pressure (or even above manufacturer's recommended), because it actually leads to improper tire wear and handling characteristics, on EVERY CAR.
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Running my tires at higher than (car) manufacturer's recommended pressure, has actually helped to even out the tyre wear.
The Volvo S40-V50 range is notorious for eating its tyres unevenly.
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how can anyone figure that the same tire pressure can be used on a 4000LB car as it can be on a 2000LB car.
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They won't even use the same tyres.
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nitrogen has the science to back it up.
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There's little point in keeping oxygen and moisture out of a tyre, as they are immerged in a bath of oxygen and moisture on the outside - combined with UV and whatever the road throws at them.
The inside of a tyre is hardly a problem aera for wear & tear - physical nor chemical. Tyres wear and chemically age on the outside.
Too little pressure however, will ruin your tyres.
Regardless of what they were filled with.
Temperature reduction and pressure variation is neglectable in a tyre used normally on the road. If you go racing, it may well become a factor.
Not all tyre fitting places get the air out of the tyres before inflating them with nitrogen - introducing 30-40 % regular air into the tyre.
It's mainly a cheap revenue-booster for tyre fitting places, compressed N2 being as cheap as it is. Well, until they pump it in your tyres that is.