I pulled #1 plug and it looked worn and fouled, however #4 & 5 had broken center electrode ceramics. Signs of running rich with #6 looking the best. These plugs had only 70,000 miles on them I expected at lease 100K! So I just finished replacing all plugs, we'll see.

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2003 X5 3.0 - 200K
2019 Subaru Forester - 80K
1986 Merkur XR4TI Intercooled - 160K