Compression Check low oil pressure Now What?

I don't know about the no flush advice. I've done a ton of them through the years and never had one single problem. The key is making sure you get it up to temperature and leave it there long enough to break everything down good. John Balkum used to run an old school service station in Macon years ago. He would actually fill the crankcase with diesel fuel and let the engine idle for about an hour if there was sludge buildup. It worked very well.