The things that matter are values seating well, rings holding back compression and oil, the bearing being tight and holding oil, and the head gasket holding in compression and holding back water.
Over reving an engine is a really stupid thing to do because it causes years worth of wear in seconds.
But smoke at the time of over reving does not really mean much of anything.
It depends on what it is like later.
The main thing one does is a compression test.
That determines if the values are burned and leaking, or if the rings are worn, cracked, etc. and leaking.
You can check for head gasket leaks with a cooling system pressure test.
As far as the bearings, exceptional wear is first noticed in lower than normal oil pressure.
If the pressure is really low, then so much oil is escaping so that the bearing will eventually melt and seize.
But as a guess, I would say that blue was oil, and you likely reved it before it warmed up, and that had a high chance of piston ring breakage. If so then crank case pressures will be much higher than usual. Such as dip stick trying to blow out the tube.
But rings and rod bearing can be done in the car, if it is low miles. If high miles, the cylinders likely need boring anyway.
Sounds like you might have blown the head gasket, a failed HG can allow oil (blueish smoke) and coolant (white smoke) out your exhaust.
You need to do a compression test of each cylinder to determine the engines health.
Didn't you post this a couple days ago? Remember? Blue smoke is oil burning?
Hope you are going to tell him! A replacement engine isn't going to be cheap.
Hi, I think I blew my friend's reconditioned motor when I redlined it during idle. I got tempted to press hard on the gas pedal during idle and it just blew a lot of smoke from its tailpipe. It still runs and idles fine,, but there was a thick smoke that came out of it. I think it was a thick white smog or a kind of bluish greysish kind of color.
Vehicle is a 1994 BMW 318i (E36) with a 2 liter engine with over 300.00KM on the odometer.
