wash oil - see absorber oil
water content of oil - see crackle test
wax (petroleum)
wax appearance point (WAP)
way
way lubricant wear
wear
weed killer
weight percent
weld point
wellbore - see borehole
wellhead
wet gas
white oil
wick-feed oiler - see oiler
wide cut - see distillation test
wildcat
wire rope
wood alcohol - see methanol
worked penetration - see penetration (grease)
workover
worm gear - see gear
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