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Originally Posted by jsbenami
Yes....0W-40, that was not a typo. I though that was thicker than 10W30 Mobil-1? I guess you'll have to educate me then  Well in any case its back to good old 10W-30 Dino oil, Castrol GTX anyways. |
Other way around. The larger the number, the thicker it is.
Engines need oil that is thin enough for cold starts, and thick enough when the engine is hot. Since oil gets thinner when heated, and thicker when cooled, most of us use what are called multi-grade, or multi-viscosity oils.
The common oils we use are called "Multi-Grade" or "Multi-viscosity) oils. A standard oil has A single viscosity, i.e. "SAE 40 OIL".
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"Multi viscosity oils work like this: Polymers are added to a light base (5W, 10W, 20W), which prevent the oil from thinning as much as it warms up. At cold temperatures the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 as a 20 weight oil that will not thin more than a 50 weight would when hot."
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Take for instance an 10W-40 generic oil. Now let's break down what this really means. What it does mean is that at cold temperatures it will flow like a 10W yet flow like a 40W oil at higher temperatures. Keep in mind that Low is 0ºF (-17ºC), and High is 210ºF (98ºC).
For more good reading:
http://www.repairfaq.org/filipg/AUTO/F_oil_facts.html
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