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What type oil is recommended for a 1990 Geo Prizm, 4-cyclinder. 5-speed with 195,000miles?
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wow 195000, you didn't say it
wow 195000, you didn't say it uses oil - several oil companies make a high mileage version. if you live north i would use 20 w 50 in the summer and like our site here 10 w 40 in the winter. it depends on how tight the engine is, if its smoking etc.