Looking for some additional feedback and advice from you all regarding my 2012 C63 with just over 28k miles on it.

Firstly, I don't drive my C63 very much, which is a shame, and I plan on changing that since I think that is the root of how all of these issues started to develop. However, when I went to fire the car up last week I heard a loud bang followed by smoke out of the pipes and rough idling. I immediately shut the car down and suspected I had a spark plug problem. My scanner confirmed that I had a misfire on cylinder 2. I pulled all of the plugs out of the car and confirmed that they were pretty badly fouled and the unusual part was I noticed that there was some wet oil on the physical plug threads (not down the spark plug tube, but just on the threads). With that being the case I ruled out it being a bad valve cover gasket, but it really bothered me to see dirty piston heads and oil on the threads. I'd like to take a quick note to mentioned that this car was just serviced (B service) by prominent Mercedes Dealership in the Dallas/Ft. Worth Area a few months ago and I have not driven it even a 100 miles since the service. I decided to check the oil level and noticed it a bit higher than the top of the red market (being too full) and also noticed a strong smell of gasoline in the oil and the oil appeared to be less viscous than normal 0w-40 oil. This really concerned me not only how I smelt gas in the oil, but how wet oil got onto the threads of the spark plugs... Is it possible if the car has too much oil that it would somehow overflow and spit it into that area? I've included some photos below for reference.

I went ahead and ordered 8 new NGK plugs and two primary (before cat) O2 sensors from Bosch. I will explain the reason I ordered the new O2 sensors below since that's a different issue. However, I was still concerned about the gasoline smell in the oil itself. My theory right now is that I have some clogged or leaking fuel injectors that are allowing gasoline to pass through to the oil reservoir based off of some reading on the site. I'm very concerned about the oil being diluted with gas and seizing my engine. I'm glad I caught this when I did, but I'm not sure if I'm on the right trail to repair these issues. Does this seem feasible and a good thought process to replace to see if that's the issue?

In addition to these issues at hand I wanted to explain the O2 situation. I'd also like to mention that the car is stock. I'll take us back to June when when I replaced the battery (thinking I was being proactive) right before my annual inspection/registration renewal. This turned out to be a major mistake as I received two "Not Ready" codes one being the O2 sensors. As soon as I saw that I knew I goofed and didn't think much about it. I drove it around a few hundred miles then took it back to be reinspected. Still showed not ready on the readiness test. Puzzled, I drove it over a thousand miles over the course of about a week to try and get the computer to ready ready and to keep the car legal without luck. I tried every "drive cycle" for a c63 I could find on the internet without luck. My only thought was that even though it didn't throw a code my O2 sensors must be bad. Everything I've read online points to the primaries having the most issues with them failing so I decided to replace them. In additon to that, I thought that could be the reason why the injectors were producing more fuel if they were getting bad signals from those O2s. I'm not sure if that was a logical train of progression, but I wanted to lay out my thought process to be critiqued and hopefully provide a better idea of the situation so you all can lend some much needed advice.

Below is a timeline of my thought process and repairs that I've made or what to make.

Step 1) I replaced all 8 spark plugs with OME NGK plugs.
Step 2) I replaced two primary O2 sensors (before cat)
Step 3) I actually started the car and she purred like a kitten without any issues.
Below is what I have not done yet, but what I believe will help fix my oil/fuel issue.
Step 4) I need to replace all 8 fuel injectors
Step 5) I need to complete a fresh oil change with Mobil 1 0w-40.
Step 6) Start the car drive it around check the oil for fuel smell over the next several hundred/thousand miles.

Any help or advice would be greatly appreciated. I want to get my M156 engine healthy again.

 

Fuel injectors

 

fix those plastic coolant pipes,i replaced all of them 1400$