6.6 Supplementary fuel additives Supplementary fuel additives The engines are designed such that satisfactory operation with normal, commercially available fuels is ensured. Many of these fuels already contain performance-enhancing additives. The additives are added by the supplier as the agent responsible for product quality. The anti-wear additives and biocides represent an exception(→ Page 83). Attention is drawn to the fact that the use of diesel fuels or additives other than those stipulated in the MTU Fluids and Lubricants Specifications is always the responsibility of the operator.
Diesel fuels with sulfur content < 500 mg/kg On Series 362, 396, 538, 652, 595, 956, 1163-02 and 03 engines with cylinder heads not fitted with valve seat inserts, the use of low-sulfur fuel (< 500 mg/kg) can lead to increased valve seat wear. This wear can be reduced by the addition of anti-wear additives. The approved supplementary additives must be mixed with the fuel in the predefined concentration. The additive must be filled before every refueling.
Microorganisms in fuel Bacterial attack and sludge formation may occur in the fuel under unfavorable conditions. In such cases, the fuel must be treated with biocides in accordance with the manufacturer's specifications. Overconcentration must always be avoided. The biocides approved at MTU are listed in table (→ Table 52).
Approved anti-wear additives Manufacturer
Brand name
Concentration for use
The Lubrizol Corporation 29400 Lakeland Boulevard Wickliffe, Ohio 44092 USA Tel. 01 440-943-4200
ADX 766 M
250 to 350 mg/kg
Tunap Industrie GmbH Bürgermeister-Seidl-Str. 2 82515 Wolfratshausen Tel. +49 (0) 8171 1600-0 Fax. +49 (0) 8171 1600-91
Tunadd PS
250 to 350 mg/kg
Table 51:
TIM-ID: 0000018624 - 003
The use of anti-wear additives is not permitted on engines/plants with exhaust aftertreatment!
Approved biocides Biocides should have a pure hydrocarbon structure, i.e. should only consist of the following components: • Carbon • Hydrogen • Oxygen • Nitrogen They must not contain inorganic substances because they can cause damage to the engine. The use of halogenated biocides is prohibited due to their effects on the engine system and the environment. A001061/37E 2016-12 | Fuels | 83
