Bosch Automotive 9657 Double Iridium OE Replacement Spark Plug Up to 4X Longer Life (1 Pk) Buick Cadillac Chevrolet Ford GMC Isuzu Mazda Mercedes-Benz Mercury, Merkur Oldsmobile Pontiac +More

Installed these Bosch spark plugs on a 2010 Ford Ranger 2.3L 4 cylinder engine in Aug 2016. This month- Dec 2019 check engine light code P0302-cylinder 2 misfire came on. Had rough idle @ signal lights. Thought it was a bad ignition coil since I replaced the old iridium spark plugs with Bosch iridium spark plugs 3 years ago. Turned out to be a burnt Bosch iridium spark plug in cylinder 2. Replaced them with Motor Craft spark plugs & the engine sounds like new. I won't be buying any Bosch spark plugs in the future. Disappointed since they should have lasted @ least 100k miles.

Plugs are stamped with made in China, They were just thrown in a big box and two of the plugs came out of the obviously cheap cardboard packages and were rattling around inside the bigger box. Really disappointed. I don't want to install these.

I installed these plugs on a 2011 ford focus. No plug is going to turn your car into a supercharged prius, but the difference was definitely noticeable. My car was a 2011, so everything already worked up to factory specs, but i still noticed faster starts, better acceleration, and lower rpms at cruising speeds. I also average about 2-3 mpg improvement. For how inexpensive these are, you can't go wrong. The gaps are factory preset, so i would recommend going to the bosch website to determine the exact number for your vehicle with their parts finder. Mine was 9657, yours may be different.

Fit perfect

My son was quite pleased with them. He was the one who put them in my car. I will order them again when needed for the Kia Soul I bought.

working like they should

Fit perfectly and increased mileage in a 2006 Ford Focus. Running great so far.

Easy installation. Engine runs fine.So far I am seeing a 1-2 MPG increase in mileage.