Regulations and care
Lubricating Oil
A4.05.08.00
M20-M601C
en / 21.08.2001 BA020067 1/8
Ĺ
1. Engine Lubricating Oil
The quality of the engine oil has a large influence on the service life and engine efficiency and thus
the economical operation.
High demands must therefore be placed on the lubricants to be used in respect of suitability.
The oil to be used should be selected according to the specifications of the fuel which is used to run
the engine.
When using heavy fuel the effect of the increased amounts of coke-type and acid deposits which
form during combustion as a result of the high ash and sulfur content, must be rendered harmless
and for this reason only lubricating oils which have been developed for medium-speed trunk piston
Diesel engines are approved.
On engines which are equipped with special cylinder lubrication the same oil should be used in the
circulation system and for the cylinder lubrication.
1.1 Base Oil
The base oil should be a high-quality solvent refined product from a source suitable for engine lub-
ricating oil and have a good oxidation stability as well as a good load carrying capacity and thermo-
stability.
Regenerated oils are not permitted.
1.2 Additives
The additives in the oil must remain effective and uniformly distributed at all temperatures occur-
ring in normal operation between pour point and 220 °C as well as in storage and also fulfil the fol-
lowing requirements in Caterpillar/MaK engines:
1.2.1 Good detergent and dispersant properties (which for heavy fuel operation equals at least
the API-CF level) to prevent the depositing of combustion products (coke and asphalt-like
compositions) or dissolves these deposits and keeps them in suspension.
1.2.2 Have an adequate alkalinity in order to be able to neutralize the sulfur acid compositions
which occur during the combustion process. This is usually given as the Base Number
(BN), or as Alkalinity Value (AV) and recorded in mgKOH/g. For Caterpillar/MaK engines
operating on heavy fuel this value should be between 30 and 40 mg KOH/g for fresh oils.
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