The Technical Data section in the Owner's Manual for our 4 MB automobiles lists the spark plug and gap, even the torque value for our 1998 E320. Guess that's an upgrade to the Owner's Manual for earlier models.

Check the Bosch website for information regarding spark plug heat range. For what it's worth I run F8DC4 spark plugs in our 1991, 1992 and 1995 E-Class cars per the recommendation of our local MB dealer's Service Department.

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Fred Hoelzle