Hello all, I will do my best to keep this to the point. First, I would like to show my appreciation for this site. Many of you provide valuable feedback you can't get anywhere else. I am a new subscriber, but have been a frequent visitor over the past year after purchasing a lemon for a commuter vehicle. The lemon is a 2004 Honda Civic EX with the D17A2 vtec, & an oil burning issue. Long story short, I put some work into the vehicle over the 10 months I've had it. Full brakes, new wheels/tires, new clutch, & other little things, however, the OG engine is now toast, & have a JDM motor being prepared for installation. It was the wiser choice with its recent upgrades & overall very clean condition. The "new" motors outside shows its age, but peeping through the fill cap looks practically new. I'll know if it's a keeper when my mechanic drops the pan, & finds flaking or not. If no metal is found, & it's OK for installation, my question is what would be the recommended approach for its 1st fire up? Should I fill the crankcase with diesel or the like, let soak overnight, then drain to flush anything out before filling with 5w20? I don't know how long or where its been sitting empty. How long should I go on the 1st OCI? A long drive, a week, a month? I'm probably going to just use the cheap Chevron synthetic blend from WM with a fram ultra, & new air filter of course, for the initial OCI, then put it on full synthetic. Would it be wise or risky to use an engine flush at some point, & which one if so? Should I give it a couple short OCI's before moving to full synthetic for 5k or fouling of the oil which ever comes 1st? This is new territory for me, & any information is greatly appreciated. Thank you all for your time & opinions in advance!