So, this is going to be a long one. I bought a 2011 suburban ltz 160,ooo miles from local dealer drove it for 2 years. Now having issues. When vehicle gets wet or a thick fog, miss fire cylinder 7, blind side indicator needs service, traction control turns off then on, last electrical component was oil pressure switch went out. Now goodnews is I had paid extra for power train warranty so dealer ship has opted to change engine new used 82,ooo miles Now I'm no mechanic but issues I've stated seem electrical rather than mechanical. But hey I'll take new engine. My reason for this post is I've hered due to fuel management system carbon builds up in engine oil causing my issues. I don't understand how but 🤷. My question is what kind of oil should I be using to eliminate this problem. I use mobile 1 or valvaline.