wow, 75w90? dude. Who told you to put that in??? If im not mistaken, but isnt that the type of oil that goes into a tranny?

For the oil experts, wouldnt the 75w mean that it would be tested at a cold starting temp of like 45 degrees? unlike a 5w or 10w would be around -20 to -30? so, isnt he basically putting in an oil that is just to high in starting temp and too thick? He would want a lower viscosity number (like 30 or 40, instead of 90) to help everything in the motor function with less friction with movable motor parts? I havent really studied oil enough to exactly know what it will do, but, what it sounds like is that when the temps got into the 40's around here, he cold-started the car and the oil was way to thick which had cause the motor to start and seize up.

All in all man, you need to start saving up for a new one. If you plan on sti motor, be ready to shell out some money. Call around and start getting prices with install. Good luck man. Next time, just look at the owners manual and it will tell you which oil to use.