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ONE-Drop provides quick and accurate visual confirmation that
its time to change a lubricant. Proper fluid maintenance will help
ensure performance, extend equipment service life, and reduce overall
maintenance costs.
When ONE-Drop results are saved and compared at
regular intervals, oil change cycles can be determined for make
and age of the vehicle, brand of oil, and driving habits, all of
which affect oil degradation. Poor ONE-Drop ratings
at low mileage can be an indicator of serious problems.
Sampling Method:
Withdraw the engine or transmission dipstick and allow a generous
drop to form on the end. Deposit the oil drop on the ONE-Drop
Test Sheet by lightly touching the end of the dipstick on the medium.
Leave the ONE-Drop test blotter in a horizontal
position for a few minutes and then compare to this reference chart.
To evaluate oil condition, match each sample to the photographs.
Backlighting samples enhances ONE-Drop results.
Simply hold the ONE-Drop up to a light, or the
sky.
Warning: All oil is to be considered hazardous. Avoid contact with
skin, eyes, and mouth. Consider all machinery dangerous. Never take
a ONE-Drop sample while the equipment is running.
NOTE: ONE-Drop is designed as an aid in determining
the condition of the oil. There is no guarantee expressed or implied
against component failure. The equipment manufacturers recommended
practices should be followed.
Repeated testing over time will increase the confidence level of
your interpretation of the ONE-Drop. ONE-Drop is
best viewed after several hours.


AUTOMATIC TRANSMISSION FLUID (ATF)
New - The sample is light in color and is absorbed by the test
medium very quickly.
Good - The fluid has become slightly darker than the new oil. It
is still well within the normal range for typical transmission fluid.
No action is required other than testing again in about 10,000 miles.
OK, Plan Change - This oil has become darker from the normal degradation
of fluid in a transmission. Note the darker brown color as compared
to the red new ATF. This is a sure sign of degrading fluid. The
fluid will still provide protection but a fluid change should be
scheduled as the degradation process will become much faster. Planning
on when to change the fluid should be based on how long (miles)
it took to get to this point in the degradation cycle.
BAD, Change - The darkness of this oil including the dark outer
oxidation ring compared to earlier ONE-Drop samples
is dramatic. Making sure that your fluid never gets to this stage
will save many dollars in needless repairs. This fluid has gone
beyond its useful life and needs to be changed immediately.


DIFFERENTIAL (F&R), MANUAL TRANSMISSION
& TRANSFER CASE
New - The sample is light in color and is absorbed
by the test medium very quickly.
Good - The oil has become slightly darker than the
new oil. It is still well within the normal range for typical gear
oil. No action is required other than testing again in about 10,000
miles.
OK, Plan Change - This oil has become darker from
the normal degradation and wear debris. The gray to black color
is iron wearing off of the parts. The oil will still provide protection
but an oil change should be scheduled as the degradation and wear
process will become much faster. Planning on when to change the
oil should be based on how long (miles) it took to get to this point
in the degradation cycle.
BAD, Change - The darkness of this oil and the black/gray
color indicate there is severe wear tacking place. Making sure that
your oil never gets to this stage will save many dollars in needless
repairs. This fluid has gone beyond its useful life and needs to
be changed immediately.


GASOLINE ENGINE OIL
New - The sample is light in color and is absorbed by the test
medium very quickly.
Good - The oil has become slightly darker than the new oil. It
is still well within the normal range for typical engine oil. No
action is required other than testing again in about 1000 miles.
OK, Plan Change - This oil has become darker from the normal degradation
of oil used in a gasoline engine. The dark brown, irregular ring
that is being formed is a sure sign of degrading engine oil. The
oil will still provide some protection but an oil change should
be scheduled as the degradation process will become much faster.
Planning on when to change the oil should be based on how long (miles)
it took to get to this point in the degradation cycle.
BAD, Change - The darkness of this oil including the irregular
oxidation ring, compared to earlier ONE-Drop samples,
is dramatic. Making sure that your oil never gets to this stage
will save many dollars in needless repairs. This oil has gone beyond
its useful life and needs to be changed immediately.
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