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12-23-2011, 10:19 AM
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I use the NGK V-power plugs only #ZFR5F11 with .044 gap. I believe these are the OEM plugs.
TomK
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2001 Mazda Millenia 2.5L Brilliant Black 187,000 miles 2001 Mazda Millenia 2.5L Champagne Silver Mica 160,000 miles 1993 Mazda 626 2.5L ATX 221,000 miles Last edited by Kutcht1; 12-23-2011 at 10:19 PM. 
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12-23-2011, 05:07 PM
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The NGK ZFR5F-11 are the correct plugs for the 2.5, and I use those. The owners manual also lists ZFR6F-11 as an acceptable plug.
The correct gap is 1.0-1.1 mm, so the 0.44 gap mentioned by Kutch1 appears to have a misplaced decimal point (manual has it as 0.040-0.043 in).
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