Mitsubishi Repair: MItsubishi Problems, mitsubishi 3000gt, crankshaft seal

Question
Hi Anthony, I figured I would give you a shot since I read your profile.

It's a 95 Mitsubishi 3000GT SL, 3.0L, 6.0 Cylinder, 24V, 5 SP manual

I had just purchased the car a few days ago from a owner that had some work done on the car last July. That included, replacing the Front Crank Seal, Front Cam Seal(4 of them), Timing Belt, Belt Tension assy. They noticed that there was an oil leak coming from the rear crankshaft seal but they didn't replace it. I drove it back home (which was about a 140m tip). Ran perfect during this time with all gauges reading normal readings. Later that evening, I started her up, and noticed it was starting to overheat and getting low oil reading. I noticed the oil dip stick wasn't even wet. I then proceeded to check the radiator fluid resevoir and it was full, but didn't think about actually checking the radiator because it might not be drawing from the resevoir. It started up for a few seconds and then died. I added oil til the reading on the stick was satisfactory. I started her up, she ideled for awhile, the fans finally kicked on and I was off. Then after driving, I start overheating again, oil pressure drops and she dies on me. Everything locks up, and I have to sit her on the side of the road. I get the car towed back to my home and let her sit. The following day, I try to crank her up, but she doesn't do anything but turnover and sounds like she is just moments from starting. I also checked for water in the engine oil and there is no signs of water. I checked all the engine  , and none have blown. I must have an aggressive pressurized oil leak, because I don't see oil on the ground when it's just sitting w/out the engine running.

1. I know it doesn't need oil to start, UNLESS the chip sensor is protecting the engine w/out having the proper amount of oil and coolent. Is that possible in this type of Mitsubishi?

2. Could the spark plugs have gone bad? What would be the easiest way to check the ignition coils to make sure they are getting a spark?

3. Could the fuel injectors, fuel pump have gone bad at the same time?

Based off the scenerio, where should a person (not engine mechanically inclined) even begin? I do have a friend that has a 3000GT for spare parts if I possibly need anything (he might have it, he might not if he had to use the part for his own 3000GT).

Sorry for the long post, but I figured it would help out if I was more descriptive with my question and problems. I just bought this car, and it already seems like I just gave free money away. If there is anymore information that you would need, please let me know.

Thank you for your time,
Destry

Answer
Destry,
Most oil leaks due occur while the engine is running.  When the car is just sitting, most of the oil will fall into the oil pan, and unless there's a leak in the oil drain plug or seal around the pan, you won't see a let when off.  It's possible oil could be leaking from the rear seal, out of the cylinder head, or even being burning in the exhaust.  If the piston rings, valve seals, or guides are worn, then oil will be pushed into the combustion chamber and burned away.  This is typically evident by bluish smoke coming from the tail pipe.

Most all cars can start without oil pressure, as there is little to no oil pressure when a car first starts.  Most are not smart enough to turn off if they do not detect adequate oil pressure either.

Spark plugs can go bad for a number of reasons.  Usually its not so abruptly and lack of spark (misfires) usually set off the check-engine-light.  But plugs are easy to check; at least the front three on your car.  

Fuel system problem are also a contributor of starting issues.  Though because fuel is the most volatile substance in your car, there are extra safety measure your car takes if the pump is not responding.  It will blow fuse.

The most competent mechanics for such an old vehicle would be those at the dealership, though they will typically be highest price.  If you can find a local mechanic which has experience with these cars, and you know their trustworthy, you can have them look it over.

Good luck!