Review on 🔌 Set of 4 New DENSO #4503 Platinum T-T Spark Plugs - PK16TT by Donald Cummings

Bought for a 1998 Saturn SL1 with stock engine and 170,000 miles. Fits perfectly and works as expected. Double platinum, therefore suitable for the double ignition system used. on them. Individual platinum plugs 2 and 3 destroy the ground electrode too quickly. They were still cheap enough for me to put them in this car. You will probably outlive the engine at this stage. Clear signs of worn spark plugs in the Saturn S-Series: * Chatter/pop under hard acceleration with 87 octane * Less than 38 mpg gas mileage on the highway with the A/C on. * Gasoline mileage less than 30mpg with A/C on. I had to adjust the spacing a bit. . Make sure you don't press on the center electrode if they have a gap. You don't want to chip the ceramic or scrape off the platinum layer. Note that they are midway between the OEM connector temps for SL1 and SL2. I'm in Texas so it's possible to chill by half a step. Many charts simply use SL2's lower temperature to substitute for SL1.