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About whydoIneedaname

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  1. I recently acquired a 2007 Chevrolet Silverado 1500 Z71 (5.3L, 4 Speed Auto). I purchased it from my grandpa who babied the truck, and put 191,000 miles on it. It has had a shockingly small amount work done over the years and drives like brand new (he kept all of the receipts). He always goes to the same shop which uses a Mobil 1 Extended Performance filter and Valvoline 5W-30 conventional oil. Now that it has 194,000 miles, should I change the oil to a synthetic blend, or full-synthetic oil? Also is it wise to use a high-mileage oil? I changed my wife's car to synthetic oil with great effect (and I realize it is a completely different situation considering she has a lower miles car, but I just wanted to express that I was open to the change).
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