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Is there a video showing details of changing the spark plugs on the Metris? I looked on uoutube and couldn’t find any. I’m a DIY kinda guy. Also, it certainly seems odd the interval is 50,000 miles- would think 100,000 would be more than adequate.
 

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50,000 is correct, these are multispark engines, as in they fire the spark plug multiple times per combustion cycle so the plugs get a lot of wear. I would not exceed the recommended interval.
 

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45,000 miles /3 yrs in my book. I'm coming up due soon... definitely leaving this maintenance job to the pro mechanic.
 

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Mileage interval is 75,000 Km. That's 46,602 miles. I don't put many miles on my Metris. 3 years was nowhere close to 75,000 Km. Time doesn't affect a device like a spark plug as it would affect oil. I'll replace the plugs strictly on a mileage basis.
 

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Mileage interval is 75,000 Km. That's 46,602 miles. I don't put many miles on my Metris. 3 years was nowhere close to 75,000 Km. Time doesn't affect a device like a spark plug as it would affect oil. I'll replace the plugs strictly on a mileage basis.
I replaced mine at 32k miles which was about the 3-year mark. I had a really hard time taking three out of the four plugs out as the design is such that ~3/8 inch of the plug thread is exposed inside the combustion chamber and mine had a little carbon build up on the threads making it hard to unscrew. A lot of back and forth to loosen it up and not damage the head threads.
Install torque is critical at 17ft.lbs. as well.
 
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