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Sat, May 10 2025, 4:55:20 GMT [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3], 4 ]


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Date Posted: 9/06/04 13:10:00
Author: UKDave
Subject: Re: Halfords Motorbike Oil
In reply to: Matt 's message, "Halfords Motorbike Oil" on 9/06/04 11:56:20

Hi, most of what you read about engine oil is ballony, I use the cheapest oil I can find.

Oil Grades
Viscosity is the primary way that oils are classified. It's easy to tell a 15W-40 from a 10W-30 because the ratings are plastered all over the containers in big bold print. But understanding what they mean can be a little tricky.

"The first number tells how easily an oil will pour in extreme cold. Many people think the 'W' stands for weight, but it's actually short for winter," says Pennzoil's Arcy, adding that six different winter classifications exist ranging from 0 to 25 in increments of five. "The second number represents how thick an oil remains at very high temperatures." These include five classifications: 20, 30, 40, 50 and 60, 20-weight being the thinnest.

While a straight SAE 0W oil may be most easily poured in cold weather and a straight SAE 60's viscosity holds up the best under extreme heat, very few motorcycles operate solely in hot or cold. That's why multi-viscosity or multi-grade oils are preferred, because viscosity doesn't fluctuate as much as with straight grades.

The most popular oil classification is 15W-40, and for good reason. It will flow like a 15W in cold weather and protect like a 40 in hot conditions. It's like getting the best of both viscosity worlds in one package.

Selecting engine oil from the shop shelf also involves choosing from the many additive packages available. They're different from those used in passenger cars. "Diesel engine oils are formulated to contain more anti-wear additives and more detergents than oil for smaller petrol engines.

Different oil brands contain different additive amounts and varieties. Among other things, they generally help improve viscosity, ensuring the oil will not thin or thicken as conditions change. An oil with a 'viscosity index improver', for example, delivers better flow without sacrificing film thickness over a broader temperature range. The ideal oil should maintain its viscosity longer.

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