My 1987 260e has developed a bad problem. I went on a 200 mile road trip and before hand I chnaged the oil with 5qts of Mobile 1 0w40 and 1qt of lucas oil treatment. Myh oil pressure was a little high, 2 at idle when it was usually between 1 and 2. So on the road home people behind me said when I accelerated i wqould get grey smoke and there was a lot of oil all over the back of my car. Little spots all up the back. I was doin 90-100the whole time so the rpms were about 4500-5000. Also, I drove on a lot of gravel, muddy, rocky and washed out roads and i may of hit a few rocks. Any idea what is broke?