This is a plug with 75,000 miles on it that is firing normally. No large deposits, not discolored . Reddish or green deposits indicate burning coolant. Black, sooty deposits indicate burning oil.
Also check for hairline cracks in the porcelain insulator (1).
Platinum / Iridium tip spark plug inspection
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1-31-11 want location of fuel filter on 2002 buick v-6 3800 model
That depends on what model Buick you are talking about. It is either on the right or left side of the fuel tank.