Thinning Oil

i have just bought a used 1992 Trooper 3.2 DOHC, i only get less than 100 miles with brand new oil, before i lose oil pressure. When I drain the oil, it smells like gas and is really thin...anyone have any ideas? All cylinders have good compression, 145-170. please reply asap.

sounds like leaking injectors
how long does it take to start when its cold

Thnx your the third one to suggest that so it looks like i had better check them out I finally got a chiltons for it Ill tear into it today let you know how it goes thnx again!!