Bosch 4431 Spark Plug

Product Review

Bosch Platinum+4 has the most platinum in the Bosch Platinum plug series.ááPlatinum +4 unique firing technology combines the advantages of surface air gap technology and 4 yttrium enhanced ground electrodes.áThe fine wire platinum center electrode (which isáheat fused into the extended ceramic insulator) reducesáthe voltageánecessary to jump the gap as well as reduces quenching.ááTheá4 ground electrode design not only provides multiple radial spark pathsábut also the surface air gap designácreates optimal exposure of the air/fuel mixture to the enhanced ignition spark. The yttrium-enhancement of the ground electrodes even further extends plug life.áAll Bosch Platinum series spark plugs are designed to reach self cleaning temperature faster for quicker starts, smoother acceleration and increased fuel efficiency.

Product Features

Revolutionary surface air gap firing technology featuring multiple spark paths that delivers the longest, most powerful spark for ultimate engine performance.
More platinum vs. Bosch Platinum plus for smoother acceleration, top fuel economy and maximum engine power.
Four yttrium enhanced ground electrodes provides optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life.
Electrode gap is factory set which never requires adjustment and ensures ease of installation.

Customer Reviews

Average Customer Review

(2 customer reviews)

Best sparks plugs, December 15, 2011

Shaun B. Porraz - See all my reviews

Amazon Verified Purchase(What's this?)

This review is from: Bosch 4431 Spark Plug (Automotive)

Just like the product description and the Bosch gaurantee, these spark plugs increased my gas milage, horsepower and better acceleration.

Good Performer, Rebate Ripoff!, May 4, 2011

D. Foster (West Valley City, UT USA) - See all my reviews

Amazon Verified Purchase(What's this?)

This review is from: Bosch 4431 Spark Plug (Automotive)

5 Stars for performance.
1 Star for Bosch rebate rip-off.
Overall, 4 stars.

Installed these plugs in my 2005 Nissan Pathfinder with the 4.0L V6. Noticeable improvement and can't wait to hook up the boat and go fishing.

Downside. Bosch reported a rebate offer. Sent in the required paperwork, bar code and amazon.com receipt. They responded and refused to honor the rebate offer. Seems they do not consider the amazon.com receipt as valid proof of purchase.