which is best spark plug for 350i?

[sprevett]

Changed mine yesterday - and re-fitted the same type which were NGK BPR6ES. Just wondered if these are the optimum choice though, as all the tips seemed very white / no deposits which acording to bible means too hot? Also, nearly all the old ones seemed quite loose and had corrosion around the body of the plug which looked to be due to leakage past the threads (presumably 'cos they were a bit loose)...I fitted them myself two years ago and would have done them up tighter so do they work loose over time? anyone else seen this?

[sprevett]

this is one of them

[sprevett]

...and again..

[CHJ]

I would say it looks like its running a bit lean, but how many miles have you done on those plugs?

[tempus]

BPR5E is the recommended one or BPR5ES as a next best http://www.ngk.co.uk/ but I think the firing end on yours looks good so I would not worry,just screw them in properly

[sprevett]

thanks for info guys - with regard to mileage, prob about 4000 ish