<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On Jan 6, 2024, at 09:00, old dirtbeard <dirtbeard@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:small">HI Moose,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="">Surprised to hear that there was sludge in the oil when you drained it; I have not experienced that when changing my oil.</div><div class="gmail_default" style=""><br></div><div class="gmail_default" style="">I also thank you for posting this message as it reminded me that I have not changed the oil in my compressor for a long time and need to look for oil. </div><div class="gmail_default" style=""><br></div><div class="gmail_default" style="">I saw this Quincy article on compressor oil options, but it does sound like compressor oil mainly needs to be non-detergent to eliminate carbon build-up (I never could understand why automotive engine oil would create carbon in a compressor which I have to believe runs at a much lower temperature than a compressor, but that is their statement), but also:</div></div></div></blockquote><div><br></div>Detergent oil keeps debris is suspension so it can be removed by the filter. If you don’t have a filter (and compressors don’t), you want a non detergent oil, so the debris can settle into the crank. <div><br></div><div>I strongly suspect moose’s sludge is a by product of condensation and short run time that doesn’t get the oil hot enough to drive it out. </div><div><br></div><div>Frankly, compressors are low load, and modern oils so good, any compressor oil is good enough. If the manufacturer makes it hard to buy from them, I take that as a sign they don’t want my money, and spend it elsewhere. It’s the third decade of the 21st century, if they don’t have a way to buy with a credit card, well, they clearly aren’t interested in selling anything. <br><div><br></div><div><br></div></div></body></html>