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I would recommend 5w-30
where is located the oil pressure switch for 94 geo prizm
http://www.ehow.com/video_11_change-motor-oil.html this helped me HUGE!!!
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
umm if it was me i would just replace the motor that gasket is way to expensive to have replaced it costs like (10.00) so i would just replace the motor!!!!!
4 quarts
May have to change oil.
75-90 weight gear oil
1.6 liter holds three quarts with a filter change.
chances are you need a new head gasket, or some other seal