[335twins]

Hi,

Car is at the BMW dealership geting 50k service done, nothing special, oil change and my SA said he will change the spark plugs free of charge, told me to consider intake valve claning (chemical treatment for $300). I would rather do walnut blasting but they dont do it and i cant find anyone that does it here in AZ, so should i do it or not? also anything else i should make them change while they changing plugs? coil packs? anything else im missing?

Thanks