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Every 4-5,000 miles is good enough, particularly when the vehicle is not high mileage. Don't listen to the old adage about every 3K. What's better for the car is putting in Slick 50 or the equivalent every other oil change if you do it yourself. It builds up a protective coating which will make the engine last longer and start up easily in cold weather. Greased Lightning (Slick 50 equivalent) for instance costs about $10 at K-Mart. Every other oil change adding it will cost you $10 plus say four quarts of regular oil at $1 plus a $3 oil filter for total cost of $17. But remember this is every other time, so the normal is five quarts at $1 plus a $3 oil filter for $8. Average is about $12.50 if you do it yourself. If you do it yourself, you should also lube the car (very few lube joints at all these days) and check air filter, trans fluid level, etc. If you are not a do-it-yourselfer, then pay $30 for a quick lube place to do it. You can also go in between and just do the oil every other time and pay the $30 the other times.
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