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Plug information & Great Chart Posted by Ari [Email] ![]() ![]() In Reply to: Spark plug change, Steve C, Wed, 1 May 2002 11:16:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Check out:
http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf
You'll see that a 5ES is a hotter plug than a 6ES. In general, if you drive your car hard, you want a cooler plug (6ES or 7ES). If you do a lot of stop and go city driving, stay with a hotter plug (5ES) to help resist fouling.
Since you've put in the cooler heat range, frankly, unless you've got some major other engine problems, you won't see any difference. If your engine is prone to running hot, this will make it run a little cooler. If your engine is running cool AND has a tendancy to foul plugs, it'll be more prone to foul. If you haven't had a plug fouling problem, and the old plugs came out clean but old and worn, then don't sweat it.
posted by 140.157.4...
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