Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1

Comment: This review isn't about the plugs themselves but the reason I purchased the parts. I wanted to do my own tune-up so I purchased the wires, distributor caps, and rotors from two other sources at the same time as these spark plugs. The shipping was free on one source and very small on the other and were both received very fast. These spark plugs came with free super saver shipping. BIG DEAL ...shipping took Forever...I even called to see if they should be re-shipped since it was past the expected received date. The rep said "why don't we wait another 5 days". The plugs came on the 5th day. Plugs order on April 12.. received April 27. A total of 15 days!! If You order these be prepared to wait awhile!!

Comment: I purchased these plugs in April 2010 to replace the original plugs that were in my 2003 Toyota Camry. The car was starting to run a little rough and I realized the plugs had never been changed. The Denso SK20R11 were the same as the plugs that were originally installed. I was surprized when I removed the old plugs at 122,000 miles how good a condition they were still in. I replaced the old plugs and the car ran a little smoother. I certainly recommend these plugs if they are typical of the Denso Iridium plugs.

Comment: replaced at 90,000 miles. runs smooth and quiet. only took about 1 hour to install.

Comment: Excellent choice for replacement plugs. I replaced my van's plugs at 53,000 and I am very satisfied.

The manual says 60k but I would not wait until then.

Comment: I just changed all 6 plugs on my 2003 Sienna at 91K miles. The original plugs are NGK IFR6A11 and still worked. Toyota's service manual says to replace them at 120K but my dealership recommended it during the 90K service. So I thought I should give it a try. Toyota's manual recommends either the NGK or this Denso. There are two Denso replacement; this one is supposed to last 120K miles and the other one is supposed to last 60K. I am glad I bought this one as the replacement of the back 3 plugs is very difficult. It took me about 10 minutes for the front 3 plugs but 2 hours for the back 3. Most time was spent on unscrewing the bolts and plugs as they were very tight and untouched for 6 years and the room for ratchet movement is small. I also bought GearWrench 5/8" swivel magnetic socket (80546) for the job, which turned out to be extremely useful for the back 3 plugs. I immediately felt improvement after the spark plug replacement. The engine runs much smoother and quieter and it reminds me of what I felt when the car was new.