In the good old days... oils were full of wax and paraffin molecules that would settle out when the oil cooled down, and form sludge. It WAS critical with those types of oil that you drain it as hot as you can get it, to remove as much wax as possible.This oil also had thinner components that would vaporize out the breather and the oil would get thicker and thicker as you ran it.
IF.. your using a good modern multi-weight detergent oil, the oil is refined so that all the heavy wax and paraffin molecules are now stripped out, and the oil has a super base additive to fight acids. This base additive also has the effect of cleaning the engine. HD oils also have an additive that keeps particles suspended in the oil so they can settle out. Also all of the thinner components are stripped out so that the oil viscosity stays consistent through its life.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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