I went with iridium's,and like the millage ,performance...
With the BKR5EKU plugs I got apx 27-29 mpg. All stock except for a neuspeed chip.
i use NGK G-power plugs in all my vehicles and they are the best ive found. they are about $2-3 tops and last forever, i have no complaints about the performance either.
I got on my last long trip 29-30 mpg doing 75-80 mph
OEM plugs which are NGK BKR5EKU used to get 26-28mpg @ 192k miles
after you get everything fixed don't run the oem plugs, they are too hot, if you want to run iridiums then get plugs that are 2 heat ranges colder and you'll be better off. you can also run copper plugs, i run ngk coppers that are 2 heat ranges colder and have had no issues at all.
I replaced my plugs with NGKs about 10k miles ago, I got them on amazon for about $12 a plug I think, engine runs great with them.
NGK BKR5E... Dual or single electrode, they both work well. These are the best plugs for these motors imo. They’re some of the cheapest as well.
I'm flashed with Revo Stage 1 and I run NGK BKR7E plugs gapped to 0.028\". They are 1 range colder and are cheap ($15 for 4 at Lordco if you have a discount). Only downside is that you should regap them every oil change, and change them ever other oil change
I changed over to the BKR7E model to see how they worked. I wasn't impressed because after that the RPMs on my tach wouldn't stay steady at idle.
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