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Correct Heat Range of Spark Plugs for 944S2 Motors

Engine

Vehicle Information: Model(924/944/968): 944S2; Year: 1989; Body Type: Coupe; Total Mileage: 85,000;

I have been running Bosch WR5DP plugs in my '89 S2 for the past 6 years with no complaints, changing them every 2 or 3 yrs. Never due to poor running.What is current knowledge base as to the correct heat range for our S2 motors?Underhood sticker shows WR7DC or WR7DP.Original owners manual shows WR5DC (the 944 and Turbo are listed as well in the S2 owners manual and list the correct plug as WR7DC for both the 944 and Turbo)The Bosch webpage list the correct plug as WR5DC or WR5DP Thoughts?David'89 S2Alpine WhiteBlack Leather85,000 mls.

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