Blue Smoke on Startup
There are several things you've stated that cause concern. A clogged pcv indicates verrrry poor maintenance. That should never happen if the vehicle is receiving oil changes on the correct interval for the user's driving style. The suggestion to flush a dirty (read sludged engine here) is a disaster waiting to happen. Engine flushes are a risky way to increase profits. I never recommended these in my shop. This advice on the part of the oil change store may be your best offence, as the engine was likely too sludged to allow for safe flushing. My motto was always: If the engine is dirty enough to suggest a flush, it is unwise to do so, and if it's clean enough to allow a flush safely, IT DOESN"T NEED IT! I suspect a clogging of the oil return holes in the cylinder heads. You could pull the vave cover(s) to inspect and unclog, or you might try checking the oil level twice. Once after an overnight rest (to determine a start point) and once after 30 minutes of driving. The heads may be storing a volume of oil enough to flood the valve stem seals and allow oil to be drawn into the cylinders past the seals. When shut down, oil runs into the intake ports and is burned at start up with a cloud of blue smoke. Then it may take some time driving to build the pooling in the heads to then show oil being drawn past the seals and burnt. Also, the oil control piston rings could have been stuck and now being loose but worn with a pattern not conforming to the cylinder walls anymore. How many miles has this vehicle been driven to get to this point? CMAT ASE L1
Last edited by protec2; Aug 10th, 2016 at 12:24 AM.
Reason: spelling errors