![]() I haven't got much spare time but it would be useful to draw up a plot of the range of oils of viscocity vs temperature for all types of oils. At normal average day temperatures of 15-25 C you will find these oils are probably as thick (or thin) as a 20W-30 grade oil.You might think 0W is too thin.but you have to understand is that the oil has simply not thickened as much as the 20 grade oil would have from 20C down to 0C. Ideally for oil damped forks you want the viscosity to remain constant rather than thin out, so to get a flatter range for normal temperature variations you could perhaps try the modern synthetic oils that can have a range of 0W-40W. ![]() ![]() The higher figure simply compares the multigrade oil to the equivalent straight grade oil's viscosity at 100 deg C so it'salways thinner or runnier than the cold figure rating. Castrolite was a 20W-30 multigrade oil.so if you want the same viscosity range then choose one that matches.Īll oils including multigrade oils thin as they warm, many people believe for example a 20W-50 gradebecomes thicker as it warms.this is wrong.
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