2009 Corolla, 145k
Believe its time to replace the Sparks.
This link says TwinTip increase fuel efficiency/mileage:
https://www.rockauto.com/en/moreinfo.php?pk=6643564
But priced lower here compared to long life:
https://www.oreillyauto.com/detail/c/iridium-tt/ignition---tune-up/spark-plugs/b14eb31b13d7/denso-iridium-tt-spark-plug/den3/4711/v/a/29866/automotive-car-2009-toyota-corolla?
Which one should I get?
Dealer said part # as: 90919-01275
Any would be fine for a 145K mile Toyo 4 banger.
I would use the factory plug to eliminate any potential issues.
Which means non - Twin Tip - the long life expensive one.
Toyota’s are fussy about spark plugs, use the Denso plug part listed in the owners manual. They last over 100,000 miles, don’t go cheap.
Some years back, I.tried twin tip spark.plugs in my 1954 Buick which had over 125 000 miles of service. I bought the.spark plugs at Western Auto. Within 500 miles of installing the dual tip spark.plugs, I had a problem with misfire. I removed the dusl tip spark plugs and installed the AC 45 specified in the manual. That cleared up the misfire. I tried using the dual tip.plugs I removed from the Buick in my.2 stroke. Lawnboy mower. The dual.tip.plugs fouled out very quickly.
This was before electronic ignition, but I still wouldn’t try the.plugs in a modern vehicle.
Just put the OEM spark plugs back in it that came out and stop overthinking it… If a cheaper plug would have worked better, Toyota would have used it… What was installed from the factory (oem) is the best plug for the vehicle…
BTW Lots of fake Toyota plugs being sold on the internet, get them form an authorized dealer or at least from your local auto parts house…
While the dual tip plugs might be cheaper to buy, they come with added risk as shown above. I’d go with the OEM plugs and know that I would avoid the fouling and knocking describe above. You might avoid those problems with the dual tip plugs, but if you don’t, you’ll buy the OEM plugs anyway. Sometimes the least expensive alternative up front turns out to be the most expensive in the long run.
As the car guys used to say, “it’s the stingy man who spends the most.”