Q, I curious as to if that 100K plug change would be your first? I also have a 2000 ML but with only 38K miles. I was considering holding off on a plug change till the 5 year mark but there has been posts discussing seized plugs if you don't change them at 4 years.

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Slowdriver

2000 ML320 (37K Mi)
1985 BMW 735i (155K Mi)
1989 Caravan (102K Mi) cargo hauler
2000 Montana (40K Mi) family hauler