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PRO-SPEC®
D. D. MOTOR OIL meets or exceeds API CF-2 and provides an enhanced
level of lubricant performance over the CD-II category for two-stroke cycle
engines (Detroit Diesel Series 53, 71, 92, and 149). Single grade oils
having less than 1% sulfated ash are preferred and primarily recommended
for new Detroit Diesel design changes.
Sulfated ash is related to the oil's
additive composition and is significant in predicting lubricants which
may cause valve distress under certain operating conditions. Most of the
sulfated ash is related to total base number which measures an oil's alkalinity
and ability to neutralize acid. As TBN increases, sulfated ash also increases
to where lubricants with TBN's above 10 will likely have sulfated ash contents
above 1.0%.
It should be understood the use of PRO-SPEC®
D. D. MOTOR OIL is with fuel with less than 0.5% sulphur. For fuels
with higher sulphur content, use PRO-SPEC®
SAE 40 with a TBN of 15. The higher TBN is necessary to offset the
harmful effects of acids formed during the burning of high sulphur fuels.
High Total Base Numbers are important
to control deposits in four-stroke cycle diesel engines and to neutralize
the effects of high sulphur fuel in all diesel engines. For two-stroke
cycle engines, Detroit Diesel recommends lubricants with a sulfated ash
content of 1.0% or less and TBN's between 6 and 10 for engines operating
on less than 0.5% sulphur fuel. Starting in 1994, diesel fuel for U.S.
highway vehicles was limited to 0.05% sulphur content maximum. The need
for high Total Base Numbers for over-the-road Detroit Diesel Engines ceases
to be a problem in the U.S.A., providing the customer is buying fuel meeting
these specifications. Of course, off highway diesel fuel may still have
sulphur content much higher and that's where real care must be exercised
in the recommendation of the proper engine oil.
If extreme cold weather (0 to -25°F.)
prevents sufficient starter cranking speed with PRO-SPEC®
D. D. MOTOR OIL SAE 40, then the use of PRO-SPEC®
SAE 15W/40 or PRO-SPEC® SAE
30 will improve startability. These oils must be replaced with PRO-SPEC®
D. D. MOTOR OIL as soon as ambient conditions permit.
Exception: Do not use 15W/40 or SAE
30 lubricants in two-stroke cycle marine engines or series 149 engines
under any circumstances.
It should be noted, PRO-SPEC®
D. D. MOTOR OIL is formulated in such a way that it will keep the
engine cleaner than low ash commercial engine oils. The reason PRO-SPEC®
D. D. MOTOR OIL is better is because of excellent detergents and
dispersants in a superior oil additive package plus highly refined base
oils. The base oils have been refined in such a way to make the oil accept
these superior quality additives - - - and the overall result is a cleaner
engine.
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