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Old 06-24-2001, 04:07 PM
autozen autozen is offline
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225

Just to add to Steve's explaination about viscosity,the numbers of 15W and 30W etc. are directly related related to the viscocity of the oil in Saybolt Universal Seconds. In other words an exact amount of oil is poured into a container, and the omount of time it takes to drain through a precisely metered orifice at an exact temperature ( I think it's 100F) is measured in Saybolt Seconds.An oil with a viscosity of 30 would take twice as long to drain as an oil with a viscosity of 15. Tribologists can use this measurement standard in machinery design. I hope this helps you understand the numbers on the can, Sky.

Auto Zentral Ltd.
Auto Zentral Ltd.
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