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I bought a 2013 Nissan NV2500 V8 with 60,000 miles on it several months ago and after a few weeks I went to check the codes and got a P0303 which indicated a misfire on cylinder 3. I was advised to use seafoam in the gas tank to try and resolve the issue and I did that but I also decided to change the spark plugs to see if that would fix the issue, I changed them all and a few of them had ash deposits (http://thezenvan.com/images/IMG_0061.jpg). A little while after doing that I started to get white smoke on startup, at first I thought it was just a side effect of the seafoam but it kept doing so for a few weeks so I decided to do a block test to make sure the head gasket wasn't the cause and the test showed it wasn't. I also changed the PCV valves to make sure they aren't the cause. I also did a wet/dry compression test which came out fine (https://i.imgur.com/OhZ4RXc.jpg), there were differences between the wet and dry results but they seemed to above minimum. There is oil being burnt because and I periodically need to add some. At this point I have no idea what's causing the issue, the warranty expired on it so I want to see if I can fix it myself. Any advice would be appreciated, thanks