BriskUSA ER15SXC Spark Plug

I had high hopes that this new design would live up to my expectations set by a number of reviews I read and the claims made by the manufacturer but everything went wrong. Out of the box, the 6 plugs I received had inconsistent resistance measurements ranging from 4600 to 6000 ohms when the the spec is 5000 ohms. That was kind of a big deal but the fuel efficiency expectation actually turned out to be a bigger issue after I saw my short term fuel trim immediately ran richer at idle and as I revved the engine up to 2500rpm. Using more fuel than before while in Park was bad enough but when I took my Pathfinder for a test drive things got worse. I had not driven more than 3mi and realized that the engine's performance was sluggish. When I got on the freeway and accelerated up to 65mph, the engine was rough and then my check engine light came on intermittently. It turned off when I slowed down, taking it home to diagnose the issue. My scan tool indicated a pending misfire code. I cleared the DTC, double checked my connections, and repeated the same sad story. I put my old used Denso plugs back in and saw my performance back to where is was before the Brisk USA plugs were installed. I measured the resistance of the Brisk USA pugs again and found the resistance of the 6 plugs increased to a range of 4800 to 6200 ohms. After 15 miles of use, to see the resistance of a cold plug increase at all is not good. Out of spec at the upper end by 20%, and now 24% after a very short use, is all I need to know as to why these plugs failed me. These were a very disappointing performance drain on my car, my time, and my wallet. I have requested a refund.

I don't know it they are better or worse. My mechanic said they didn't fit as expected, even though they were clearly marked as for my FJ Cruiser. I gave them good marks only because I am not 100% sure my mechanic was installing them per spec. I have another mechanic I know is great and plan to have him double check in the near future.

These plugs were utterly terrible, nothing but part throttle hesitation and hiccups and intermitten power at full throttle. Switching back to Stock NGK V-power plugs was a huge night and day difference. This particular design sucks and the spark is too shrouded for decent combustion...

Wrong item for wrong car