amarlondis wrote:This is the conclusion to this post. I bought a set of Bosch Double Platinum spark plugs and install them. A few weeks ago I notice when I'm accelerating about 0-60 mph the car was stuttering when pressing the gas pedal (intermittently), as if its struggling. If I'm at a steady 40-50 mph it would do the same. I've checked the my oil, antifreeze(coolant), and transmission fluid and they're all looking good so far, and also did an oil change, and the problem still persist. I took the car to the dealership and they inspect the car and said that everything is OK, but the spark plugs may be the problem. He took out a spark plug and showed me that the tip of it was discolored. He check the spec on the car just to find out that the spark plug which was in is a Bosch Double Platinum(which I installed) is the wrong type. He recommend NGK Iridium IX which is design for the car. I call a friend of mine who works at a Honda dealership, and also at the auto parts store and they said that these newer cars have to get the recommended parts for it to work efficiently( better fuel economy, and longer life to the engine). The mechanic at the dealership was charging $150 for parts and labor for 1 hour, so I took the car home, bought the spark plugs and 2 lubes for it for $39.94 and installed them myself. Now the car is running smoother and I notice the gas mileage it better. I hope someone get something out of this.
This isn't very scientific, but I prefer to put German plugs in German cars, Japanese plugs in Japanese cars, and American plugs in American cars. The main reason is that they are the easiest to match in terms of being specified for the car given the respective OEM support.
I always use Japanese plugs like NGK in my Japanese cars and never had a problem.
In my VW, I recently put in Bosch Platinum plugs because they were on sale and were specified for the car. They fixed a misfire the VW was having and it runs good now.
I've heard that the Bosch plugs with multiple ground/side electrodes can cause issues in some cars.
I'd say that the NGK Iridium IX's are great plugs. I've used them in most of my previous Japanese cars with good results though they won't last as long as higher quality iridiums like NGK's Laser Iridium or equivalents from Denso. These are intended as OEM plugs with a lifespan of around 100,000 miles.
I'm curious as to why you changed your plugs unless your mileage was close to 100,000 miles. The OEM plugs are iridiums with a lifespan of around 100,000 miles.
There won't be any warnings this time around. (I've already cleaned up at least two other inappropriate posts in the last couple of days.)
