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I havn't replaced my plugs yet, but here is what the owner's manual says for my 1999 S-70 GLT:
Distributor ignition system
Firing order 1-2-4-5-3
Distributor ignition setting Not adjustable
Spark plugs Bosch FR 7 DC or Champion RC9YC
Spark plug gap 0.028" (0.7 mm)
Turbo-charged models: Champion RC8PYP (or equivalent)
Spark plug gap 0.03" (0.75 mm)
Tightening torque 18.4 ft. lbs. +/- 3.7 ft. lbs. (25 Nm +/- 5 Nm)
Hopefully what all these OEM replys mean is to buy the recommended plug in the manual, not necessarily pay the dealer $7 per plug when parts shops have them for less.
MH
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MH 1999 S-70 GLT & 2001 S-60
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