White smoke blows out the ignition.

What is your question?

Upon ignition, white smoke blows out of the exhaust. The vehicle burns oil. It doesn't leak oil: no drips or puddles on the driveway. I've been told that when my car is parked, the oil seeps. I may have a faulty seal. The smoke comes from the oil burning off upon ignition. My check engine light came on with code P0306 cylinder 6 misfire detected. It also started "shaking" when stopped but ceases once I accelerate. I'm told the seeping oil eventually will foul a spark plug. To rectify that, I put in Seafoam with every fill up. mechanics have said I need an engine tear down to find out if I have a valve, ring, cylinder issue. Cost $3,000 plus then the actual repair! if I just keep using Seafoam in the tank and Restore or Lucas in the crankcase, is that enough? It's a 2009 with 110,744 miles. I bought it 3/2020, used, from the Subaru dealer with 92,281 miles. On average I drive 700/month. I have no money for a hefty repair bill. Your advice is greatly appreciated. Thank yo

What makes this problem better or worse?

Worse upon ignition.

How long has your 2009 Subaru Tribeca had this problem?

2021