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Denso plugs

trazom

By trazom,
in Corolla & Corolla Cross Club

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trazom Newbie

trazom

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Hello.  My 2011 Corolla has 149K, runs beautifully.  Owners manual specifies Denso Iridium SC20HR11 plugs.  I bought 4 new ones and replaced the old plugs, which were Denso Iridium SC16HR11s.  I have discovered belatedly that the SC16 plug superseded the SC20 (something to do with heat range).   So the order of the plugs in this car:  SC20s, SC16s, and now SC20s.  Checking with experts here to make sure that I am still ok with the original SC20 plugs.  Car runs nicely after plug replacement.  Thank you.

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