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I stopped by Walmart today, and picked up enough 5W-40 Mobil 1 for two changes. They did not have any 0W-40, but the manual says 5w-40 is OK, I don't anticipate temps below -20*F here. The price was $20 for a 5 qt. jug, and the one quart containers were ~$5 each.
I will be doing the changes myself, as I have always done. Even so, between the 7 qts and a Mobil 1 filter, each change will cost me ~$40 just for supplies.
I only put about 7K on my car / year, so I change the oil every 2500-3000 miles. If I put more miles on a car, I think I would let it go until 4 or 5 K.
I'm a firm believer in doing the first oil change at around 300 miles, because the most wear takes place in an engine when it is brand new. You also have cleaning solutions, casting by-products, and general crap left in the engine from the manufacturing process.
-Steve
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