My 2010 RX350 with the same V6 has 170k on it and still gets me 24 MPG - Denso factory plugs are life, prove me wrong.
NGK OEM equivalents or Denso IK22 for a slight bump in performance.
Bosch Plugs are tops in any application you use them for... All of their parts are worth what you pay for them...I've...\"NEVER\" had a Bosch part of any kind to fail at its applied usage...! True top of the line German Engineering... period...!!!!!!
I used Bosch plugs in mine about 3 months ago and I couldn't be happier.
I’m running Denso plugs in my car…no issues to report.
I’ll stick with NGK and Denso.
Back in March two days after finishing the Water Pump replacement it started misfiring. I started with replacing the spark plugs with OEM Denso's, but that didn't fix it but was VERY NECESSARY.
Ive used bosch irridium plugs as replacement for the original denso ones in my GFs 2015 yaris and the car started to have misfires (noticable shuddering) within a couple of weeks. The bosch part is listed as compatible with the OE number, but issues nonetheless. I'm currently going through the warranty process and definately wont be using anything other than the direct denso replacement.
I had EPC light/limp mode and P303 as well about a month ago on my '12 GLI (APR Stage 1+) at 102K miles that recently had a walnut blast and new Denso plugs at around 101K miles. Swapped coil packs as well and still P303 with EPC light/limp mode.
Yeah I own and operate an auto repair facility and refuse to use Bosch plugs because I’ve had a lot of issues with them in the past. Misfires mostly.
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