Ford 2006 Mountaineer Owner's Manual page 690

Maintenance and Specifications
For PCV valve replacement, see your authorized dealer. Refer to
scheduled maintenance information for the appropriate intervals for
changing the PCV valve.
Replace the PCV valve with one that meets Ford material and
design specifications for your vehicle, such as a Motorcraft or
equivalent replacement part. The customer warranty may be void
for any damage to the emissions system if such a PCV valve is not
used.
2
For spark plug replacement, see your authorized dealer. Refer to
scheduled maintenance information for the appropriate intervals for
changing the spark plugs.
Replace the spark plugs with ones that meet Ford material and
design specifications for your vehicle, such as Motorcraft or
equivalent replacement parts. The customer warranty may be
void for any damage to the engine if such spark plugs are not
used.
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2006 Mountaineer (mnt)
Owners Guide (post-2002-fmt)
USA (fus)