I have a Harbor Freight 8 gallon 120PSI compressor that has paid for itself half a dozen times over just in fees saved for blowing out my sprinkler system.
I use it intensely once a year for sprinkler blowout (9 zones x 6 repeats per zone) and about 1-2 times per month for light project use (usually just fills the tank a couple of times).
The compressor takes about 25oz of 30 weight non-detergent oil. The oil level seems to remain pretty steady in the window.
- Should the oil be replaced at regular intervals?
- If so, is there a good general rule of thumb for how freqently to replace (either in terms of calendar time or usage)?
- Also the manual says use "30 weight non-detergent oil". Can I use the oil so labeled at an auto parts store or do I still need to buy "special" compressor oil of that weight?
Thanks