The fact is it can hurt your chainsaw.Viscosity is the resistance to flow or thickness of an oil.Chainsaw bar oil has a high viscosity.Motor oil that has been in your engine for 10,000 miles has lost much of its viscosity.Heating and cooling the oil reduces viscosity.
Yes, it is certainly less viscous, but my point is that the viscosity doesn't make a large impact. In an engine? Yes, viscosity is huge, on a b&c, no it doesn't matter much. Yes, the oil slings off more easily, but as pointed out earlier, it doesn't matter much when the saw is turning 13k rpms, even B&C oil slings off at that speed. The oil residue is still there however, and that is where the lubrication comes from. B&C oil that slings off is supposed to sling off, that is how it carries the particulates away from the b&c.
The used oil also has metal and dirt particles in it.
And your chainsaw bar doesn't already have those? That was one of my points in my original reply. Those particulates may be detrimental in an engine, but those particles don't matter on a chainsaw unless they're HUGE (relatively speaking), that is why cars have oil-filters and chainsaws don't. Chainsaw only have a small screen to prevent large particles from clogging the pump etc. Don't you think that if it was really that important to keep tiny particles out that they would install full-size oil-filters on saws? Most particles in used motor oil are comprised of worn bearing material. Bearing are soft metals that actually have lubricating properties on their own (bronze). Those particles are not going to cause any detrimental effects on your b&c.
Runnig your saw with used oil will lead to the bar wearing quicker.Plain ansd simple.Maybe some of you don`t consider overheating your bar and chain, damage, but I do.It will wear the bar out faster.All this was said previously.It WILL wear your bar and chain faster....
Proof? Have you done any scientifically controlled studies or do you have any results from such studies?
Even if your b&c does wear faster, how much faster? Hypothetically speaking, if your claim of increased wear is true, lets compare the economics of it. We'll say that you reduce your b&c lifetime by 10%.
Jim Bob has a 25 inch b&c on his saw, he cuts enough wood to go through 3 chains and 1 bar every year, at a cost of $100. While cutting with those chains and bars he burns... oh let's say 12 gallons of b&c oil per year on those. Even the cheap TSC oil costs him $6/gal so his cost on oil is $72/year.
Now, Jim Bob is thinking running used motor oil that he gets for free (some could even counter that they normally have to pay to dispose of used oil but we'll ignore that) when he changes his oil. He buys his bar and chains for $100, but only gets 90% of the life out of them. So his cost for 90% of a year is $100 vs. his cost of $154.80 for 90% of a year when running b&c oil in his saw.
His cost savings on oil more than makes up for any additional wear on the b&c, as a matter of fact, using used oil would need to cause 42% more wear before it becomes economically equal to run either oil. Of course that scenario is hypothetical and the consumption numbers may not completely line up, every saw and user is different, but it demonstrates my point exactly.
opcorn:
