E3.81 E3 Premium Automotive Spark Plugs (4-PACK)

While I think these are great plugs, I think they run a little too hot for Toyota's liking. I know most people are going to say how can they run too hot. I had one spark plug boot that changed color from the heat. The plugs themselves were very white ashy after only 15k miles in my corolla. I have heard mechanics say only use denso or NGK in toyota, and I would also recommend that. It also started to jack with the idle of my car after the 15k miles. I put NGK bak in the car with no issues.

I gave a rating on these plugs right after I ran the car the first time. I have had them in about three weeks now and can give a little more info. My mileage went from 31.8 mpg with air cond. on to 32.3 mpg with the air on. Not too bad. Car seemed a little faster in the pick up not a lot but noticeable. Idle was smooth with no stutters. Overall I am glad I installed them.