10W-30 is preferred. The rest depends upon you Synthetic or Conventional (dino). I side with the Synthetic better engine protection. As long as you have no major leaks, should be fine. Good Luck and Remember.
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where is located the oil pressure switch for 94 geo prizm
May have to change oil.
chances are you need a new head gasket, or some other seal
The oil capacity on a 1996 Geo Prizm is approximately 5 quarts. The recommended oil type is 10 W 30.
5W30
Every 5.000 miles
4 quarts
I would recommend 5w-30
Was told a 93 Geo Metro with high miles should us 10W30.
http://www.ehow.com/video_11_change-motor-oil.html this helped me HUGE!!!
75-90 weight gear oil
1.6 liter holds three quarts with a filter change.