I have an 86 b2 with 240 k on it. While driving home today I started losing power. I looked down at the oil gauge and it just dropped to below low! I pulled over and checked the oil and it was way above the max mark?? I coutinued home and slowly it kept going slower and slower. I pulled over and let it sit for 30 mins then made it the rest of the way home. What is going on?? Any advice would be much appreciated!