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Went to replace #4 glowplug yesterday. Got engine nice and hot and removed old one without any problems. Went to fit new NGK replacement ( from our friendly 300C shop ) and it really didn't to want to go in to even begin the threads. A quick compare of old and new and the tip looks slightly wider on the ngk than the oe part. Tried again thinking the hole may be a little coked up ( after running with a failed plug for a while I guess it doesn't burn off any carbon build up ) after turning the plug with the 8 mm socket it began to thread in but was getting tighter as it screwed in. I backed off at this point and removed it and popped out to ECP and bought another Hidria glowplug. Got back removed the failed plug and the Hidria went in without a problem.
Wondering was this just a bit of carbon build up and I was being over cautious or has anyone else had problems with NGK replacements ?

No codes and starting on all 6 now ready for the cold weather :)
 
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