As has been stated previously, the old philosophy was to drain warm to ensure the majority of thick oil was removed from cavities and block walls, also that any debris in suspension was removed. The warmer the oil the higher chance of debris being removed from the base of the wet sump.
Modern oils are much better at flowing but it still remains, warm oil flows better than cold.
As to cost, it is like the everlasting light bulb that will most probably, never be commercially available because it will do the manufacturers and their workforce out of a job; modern oil will last a lot longer than the manufacturers/authorities change-out time.
Unfortunately we are regulated to change it at their prescribed frequency, hence the cost and keeping people in jobs (oh yes and shareholders happy as well). Cynical, who would have ever thought it! :diablo:
Run your lawn mower for a year and see how it is. Usually pretty clean. Manufacturers often prescribe change at 25-50hrs or annually whichever the soonest! Modern oil will possibly last in excess of 100hrs in a 5hp mower.
Oh well back to scalded hands.:D
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