2006 Toyota Sienna spark plug replacement

Dear Doctor: I own a 2006 Toyota Sienna with 43,000 miles on it. The owner’s manual states to change the spark plugs at 90,000 miles. I called a couple of dealerships and they stand by the manufacturer’s timetable. I have seen spark plugs that were almost welded to the cylinder heads after 90,000 miles. Should I change the spark plugs on my Sienna at 60,000 miles and disregard what Toyota recommends? Dennis

Dear Dennis: I twist wrenches six days a week and when it comes to spark plug replacement I have seen more frozen, rotted and broken spark plugs than I should see. The most common broken and frozen spark plugs are found in the Snow Belt. Any spark plug that is subject to the weather elements will be affected. I have not had any problems with Toyota engines; however, I would still go with the 60,000-mile replacement, not 100,000 miles. — Junior Damato, Ask the Auto Doctor

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