dabangsta Posted April 22 Report Share Posted April 22 I bought the SP550X as specified in the owners manual, which in the old part number scheme is CYFS12YPCTX (which each set of letters and numbers can be decoded), but they also show SP594 when I put in my VIN at fordparts.com SP550(X) - CYFS 12 YPC TX SP594 - CYFS 12 YR T3 The first group of letters are the thread, reach, seal type. 12 is the heat range. the suffixes includes ones I have never seen before, and all decoders I can find don't include these (like EE or PP is Double Platinum, N is Nickel) Anecdotally the shell/threads look like a different material, like nickel versus something else shiny but more golden hue (stick with me here...). I am going to put in the SP550 but curious if anyone knew how to decode the suffix and what the difference in these plugs are. I already know that SP550X supersedes the previous SP537 (CYFS 12 Y2) Quote Link to comment Share on other sites More sharing options...
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