I agree. Its like the hot item anyone can afford. I'm sure people put it down in their list of mods. 
0w40???
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The 40 Weight is thicker than the 30 weight, thats why it cuts down on the noise a bit. The downside is that it doesnt flow as well through oil passages as a thinner oil.
The internet rumor is that Mobil 40 weight is more like a 30 weight in other brands of oil.
The 0w, 5w, and 10w part refers to the viscosity when cold. Once warmed up it will act as the viscosity of the second number ie 40 or 30.
The internet rumor is that Mobil 40 weight is more like a 30 weight in other brands of oil.
The 0w, 5w, and 10w part refers to the viscosity when cold. Once warmed up it will act as the viscosity of the second number ie 40 or 30.
Also, one company's 5w-30 can be thicker or thinner than another's 5w-30. Just like two tires rated at 300AA can have completely different tread life. The prime example of this is GC 0w-30 is thicker than M1 5w-30, as GC acts as something closer to M1's 40w when hot. This is why it tends to quiet down the motor in some people's cars.
Your car will not be noticeably slower. That's a complete illusion. We're talking fractions of horsepower sacrificed with a thicker oil, and by thicker we're talking a very small difference.
