What do you guys think about using something like 10w30 engine oil in place of bar and chain oil in a pinch? Forgot my B&C oil at home today but I've got a quart of 10w30 in the truck.
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Way oil for machine tools has similar properties to bar oil - very sticky,extreme high compression, need to cut it a bit with kero or diesel for the chain saw pump. Dino oil does not break down itself, but the additives in used auto oil do hence the replacement intervals. Running it through say a 5 micron filter would clear out about 90 % of the sludge. Tackifiers can be purchased if one wanted to go that route. An oil change on my diesel is 4 gallons the other truck and car - add 2.5 gallons every 3 months ( 6.5 gallons of oil every quarter) I can make a lot of bar oil that way. I use synthetic ( mineral oil ) in all 3 and the tractor ( about 3 gallons once or twice a year) .