Hi,
Having problems with my polo G40.
Here it goes,
When engine is cold, dense white to gray smoke comes out of the exhaust pipe. When it reaches normal engine temp, blue smoke is coming out of it but less dense. I have disconnected Oxygen sensor because the idle was erratic and black smoke was coming out of the pipe, witch means bad air/fuel mix. I have in mind changing the blue temp sensor to.
The last time i changed the oil did not found 10W50 so i putted again 10W40 with some oil additive, witch had reduce a little the smokes out of the exhaust.
The engine has 110000km and was stopped for some months (said the older owner), its not drinking water but its obviously drinking oil.
At the beginning i thought it was the PCV ( Positive Crankcase Ventilation) blocked, forcing the oil passing through the piston rings (witch i learned it is a common problem o G's), but my regular mechanic said it was probably the valve sealants.
I meet another mechanic that was recommended to me because he have done nice preparations on Rally G's. It was quite impressive to see he diagnosing the car, after 10min he said it was piston rings. After that i kept wondering, "How the F*** he knows its piston rings without doing a compression test???".
How can i test if it is the PCV valve, my regular mechanic was afraid of braking the thing, its well attached to the engine.
Sorry about my "Engrish", im Portuguese living in Madeira island.
Thanks in advance for any help.