Spark plug Bosch or OEM Subaru

My 2017 VW Jetta 1.4 5M - at 67760 miles on the factory original plugs - now has new Bosch Iridium/Plattinum plugs - (YA5KIP80)..................(the only symptom on the old plugs was a MPG drop - no hard starting, no missing, no rough idle......... EZ

changed out the spark plugs, all except for cyl 1 had crazy looking plugs. Used Bosch platinum 6704 cleared up the CEL and also the stability and TC lights no longer flash so somehow that was connected I guess.

For iridium spark plug. Do NOT gap them. I have bosch double iridium spark plugs and over 120K miles now. Still goes strong.

My car has Bosch Double Iridium spark plugs. Over 120K miles now still go strong.

I just got Bosch ones for my 2gr in the Lexus. Worked well, no complaints. And they weren’t badly priced

The car works almost fine with the new bosch , i have a little vibration on idling .

I learned this after installing Bosch plugs in a Honda many moons ago. Japanese cars like Japanese-designed plugs.

I replaced mine with Bosch once, it drove like shit and I immediately replaced them with NGK.

I put the expensive double spark, spark plugs into a Mitsubishi galant one time. Plugs were supposed to be hotter and make the car run better, after a couple weeks I swapped them back out for nkg’s that I checked the gap on, car ran better.

Never use bosch plugs. I work in a bosch car service and we won't use em, NGK only. Bosch stuff is garbage