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Cooler spark plugs

I am thinking of substituting a cooler range of spark plugs for the bosch wr7dc's that I now have in my 1988 740 turbo. I went to their web site and the next cooler plug is the WR6DC. Has anyone tried these? The reason for the switch is that my car is making a pinging sound that I can't get to go away. THe other possibility is an NGK BPR7ES. What do you think?






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