Hi RiCey,
sv6 2009 sidi sedan series 1;Mechanic put in 5w-40 instead of 5w-30. Since I got it back its constantly misfiring.
Coils & sparks & throttle body, new battery, oil & filter, fuel pressure test, compression test, engine valve clean, replaced crank angle sensor, manifold leak down test and reset ECU. The misfire doesn't seem to happen if you keep the revs under 2k; & also if same speed on the motorway. If you give it some or speed up or slow down it misfires P300 codes (mainly 1,3,5) but also 2,4,6. One time I slightly swerved to avoid a lorry pulling onto the motorway and 2 seconds coming back into the inside lane it misfired.
The funny thing is that sometimes if you stop turn off the engine and turn it on again, it clears the MIL and you can continue driving (under 2k revs) but if you go above that it gets upset and misfires again.
Someone said the oil can play havoc with the actuators ... any thoughts on the actuators or other probs; so far its cost me over 2k