Spark Plugs - Revised Plugs and Tightening Torque
88porsche05Subject: Spark Plugs
Model
All
Group
2
Part Identifier
2870
Number
8805
September 23, 1988
Below is a listing of all tested and approved spark plugs.
- spark plug tightening torque: 30 N-m (21.6 ft. lbs.)
- it is recommended to lubricate the threads of spark plugs lightly with graphite grease (Molykote paste HTP white), or equivalent, prior to installation. Make sure paste is kept off the electrodes and the inside of the spark plug!
Resistor Type Spark Plugs
Resistor spark plugs are used since M.Y. 1985 to eliminate radio interference. These spark plugs may also be used in older models. Resistor spark plugs can be identified by the "R" in the type designation, e.g. WR7DC.
Bosch Platinum Spark Plugs
Spark plugs designated with the lefters "DPO", or W3DPO on the new Bosch spark plug Designation System correspond with the conventional design platinum spark plugs from the old system which were W28OP21.
Spark plugs with the lefters "DP" or CP or W5DP or W3DP are platinum spark plugs of the new design with a sintered center electrode. These spark plugs must not be installed when conventional design platinum spark plugs "P21" or "DPO" only are specified.
ORDERING INFORMATION
Bosch to Porsche
W3CC 999 170 162 90
W3DP Use W3DPO
W3DPO 999 170 128 90
W4CS 999 170 140 90
W4DPO 999 170 008 90
W5DC 999 170 165 90
W5DPO 999 170 017 90
W6BC 999 170 167 90
W6D 999 170 056 90
W6DPO 999 170 049 90
WR6DS 999 170 175 90
WR7DC 999 170 158 90
WR7DP 999 170 174 90
WR7DS N 017 811 37
W8D 999 170 134 90
W8DC 999 170 170 90
WR8DS 999 170 062 90
Copy of Superceded Bulletin