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Motorcraft Spark Plug Set - SP-537 Focus ST & RS
Motorcraft Spark Plug Set - SP-537 Focus ST


 
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Motorcraft Spark Plug Set of 4 - SP-537


SP-537

Focus ST 2013-2018
Focus RS 2016-2018

The EcoBoost engine operates under extreme conditions including high cylinder pressures. The spark plugs are subject to rapid wear rates, even at standard performance levels. Engines running higher boost points or increased levels of tuning can experience reduced spark plug life resulting in lower engine performance, misfires and rough idle. Increased wear is typically seen in the form of increased spark plug gap and degradation of the electrode.

For optimum power and performance we use genuine Ford Iridium spark plugs and replace them every 10,000 – 12,000 miles.

For standard engines and mountune performance upgrades, we recommend and use standard heat range spark plugs. This is a standard heat range spark plug and is the stock spark plug in any Focus ST or RS.

  • Genuine Ford Motorcraft
  • Iridium
  • Pre-gapped

Average Rating: 5 of 5 Total Reviews: 8 Write a review »

  0 of 0 people found the following review helpful:
 
Spark plugs July 4, 2018
Reviewer: adam molatore from fallon, NV United States  
They are a 100 percent factory replacement. Alot cheaper than going direct to ford. I called my local ford dealer in Fallon, NV they wanted 13.95 per plug.


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  0 of 0 people found the following review helpful:
 
December 20, 2017
Reviewer: Roger Collins from Glen Allen, VA United States  


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  0 of 0 people found the following review helpful:
 
Spark Plugs September 5, 2017
Reviewer: B from United States  
All 4 plugs measured very close to each other. Between .0275 and .0280 Everything looks great and they work too!

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  0 of 0 people found the following review helpful:
 
Check Gap August 5, 2017
Reviewer: Trevor Brown from Corona, CA United States  
OEM quality, direct replacement. Gap was barely off, but I figure that could be a shipping issue. No matter what, check plug gap before install.
15k Miles and still racing, gap has held and performance has not changed.

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  0 of 0 people found the following review helpful:
 
OE standard plugs the best. All you need. April 27, 2017
Reviewer: Rui Monte Da Silva from Dubai, United Arab Emirates  
I used the Aramex shop n ship and got it in 3 days from US to Dubai. My ST is with MR300 and the stock plugs are the best for smooth idle and performance. Mountune sell them pre-gapped and were a perfect 0.028 gap. Called Mountune staff and they explained nicely how to do a perfect DIY install of the plugs. Happy with the service.

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