Posted by jdemaris on December 03, 2009 at 06:24:14 from (72.171.0.143):
In Reply to: Autolite sparkplugs posted by dave2 on December 02, 2009 at 23:57:21:
Something in all that does not make sense. If true, it would mean that the different spark plug companies do not know how to make spark plugs that are equivalent to each other - or refuse to do it and lie in the cross-reference charts. A spark plug is not all that complicated. You've got a built-in carbon resistance unit with a fixed value, an insulator, electrodes, and an air-gap that determines operating voltage.
Without specific brand and part #s, I'd guess and say someone is not doing their homework with proper cross-referencing.
I do know that many major auto parts sellers list "near perfect" equivalents for many applications instead of stocking all the proper ones. That keeps stock needs down. That goes for spark plugs, filters, belts, etc.
My 95 Subaru Impreza had 120,000 miles on it before the first time I touched the plugs. One day it would not start although it had been running perfectly before. It has OEM NGKs in it. I pulled the plugs and found the gaps at over a 1/4". I stuck in new Champions, gapped properly and it ran just the same. Starts at 30 below F, same fuel mileage and it now has 190,000 miles on it.
My 2000 Dodge Grand Caravan had 140K miles before I pulled the plugs. It still ran fine, but I figured it was time. It had OEM RN14PMP5 Champion platinum plugs. I replaced with Bosch platinum and so far put 30K more miles and it starts and runs exactly the same.
My 1999 Kia Sportage has also had several brands of plugs and runs exactly the same.
I could go on, but my experience has been that I've never had a problem when comparing "apples to apples" with quality modern plugs. With some of the other stuff and cheap junk made for tractors that don't have to pass emissions tests - it's a different story.
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