In general there has been no
apparent attempt to cover up the odors of gear
oils which arise
from EP additives. Occasionally
pine oil or pine tar will be detected in lubricants designed for exposed gears.
Sulfur compounds perhaps
have the most disagreeable
odor of any additives and
consequently Jonach^46 suggested
treating such agents
with lead peroxide
to react with
any free hydrogen sulfide
which might be present.
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