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Q:

how often should i change the oil every ---- miles? on 2002 Suzuki Grand Vitara

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i know on newer vehicles manufactures suggest anywhere from 3000 to 9000 miles. i dont have a manual to look in.
(2) Answers
According to the manufacture under normal usage it's 7,500 miles or 8 months. Under severe usage every 3,000 miles or 3 months. That is what Suzuki recommends. I strongly suggest you go to a semi or full synthetic lubricant. A viscosity of 5-30W is what Suzuki recommends.