Spark plug Bosch or OEM Toyota

Use the Toyota OEM iridium tip plugs. They are amazing!

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.

Toyota Corolla (2017) gets 30/36 mpg and cost $13K with 80K miles on it. Insurance $100/month for maximum coverage. I have had it since 2019 and have never had any maintenance except spark plugs (once), battery (once) and tires (once), and oil changes. So I have spent maybe $1000 on maintenance in 6 years.

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.

Customer had misfires, bought oem spark plugs and coil pack. Customer came back couple months later, misfire came back. Found that port injector was bad.

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

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

BOSCH stopped German manufacture of spark plugs long ago, they suck now.

Mann fuel and air filter, Bosch distributor cap and rotor, NGK spark plugs and NGK wires. I had Bosch spark plugs W6DPO, the car runs exactly the same.