I decide to drive my 280z over 220 something miles(Panama city to Jacksonville FL). I wrongly assumed my car had oil and was ready to go. After 2 hours on the road, I noticed as i drove up steep roads my speed would go down. Then i notice i couldn't get past 70 going down. Then i was below the minimum speed limit which was 50. Lucky for me it was 9 or 10 at night. Then my car started to shutter. I pulled over and checked the fuel pump...... No leaks. The engine looks good. My first thought was overheating. So i sat on the highway for about 30 minutes. With temps in the 40's that sounded long enough. So i start it up, its normal so i drive and it shutters slightly. 4th gear is slow as dirt so i stick to 3rd. In 3rd gear i top out at 50 up and down hills. Then my car goes nuts it starts to backfire with the slightest pressure on the gas. So i get off the interstate under and quiet overpass. I see that the rear axle is slightly wet. Yet is see no fuel leaks. I look at the front and the oil pan looks like i drove through a puddle. I check the oil, there is none. My car now sounds like a tractor and shakes like Muhammad Ali's parkinson's. So i get it to a hotel parking lot and it can barely move. I put in 4 quarts of fluid but it wont even rev and it backfires. My dad first thought i threw a rod but he now thinks its a head gasket. Around the cover is oil and my oil looks like coca cola all over my block. I'm mechanically incline with aircraft since i work for the United States Air Force but this Japanese straight 6 looks like a nuclear physics equation. Does anyone have suggestions on how to fix this and get it road worthy to drive at least close to normal. This is my first vacation and right now its been ruined by my neglect and ignorance. Someone Please Help!!!!!