I bought my 1999 Merc Sable in 2000 used with 23k miles on it. It now currently has 338,546 miles on it as I type this. It has the 24 valve Duratec engine. Somewhere around the 150k mile mark I switched from Motorcraft plugs to Bosch platinum +2 plugs. I have nothing but good things to say about the Bosch plugs. The most noticeable improvement is better engine performance, pickup, and smoother idle. My car burns about 1 quart of oil every 1000 miles which from what I have researched is not unusual for such a high mileage vehicle. Although the plugs are clearly exposed to oil fouling, the Bosch plugs handle it just fine. Better than the Motorcraft plugs in my opinion.
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