I got this to replace the plug in my 7 year old Bolens riding mower with 18.5 horse engine.  I wanted something that would work well and have a strong spark.  This platinum tip plug will have such a long lifespan, I know I'll never have to replace it again.  The mower is well taken care of and runs beautifully and I really want to keep it running that way for a nice, long time.  Using quality parts will help assure that.