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Determining the type of contamination will determine the problem. For example, If it is rust, most diesel engines have more iron in the block and heads than car engines. Rust forms from inadequate antifreeze concentration and from not being used much such as in storage, not a big issue, flush with a suitable cleaner & refill with low silicate coolant not common auto types. If fuel is smelled in the ccolant, then injector seals may be bad or a head gasket. If there is oil in the coolant then oil cooler leaking is indicated. If there is a light green scale noticed or a green goo substance, it's caused by not using low silicate antifreeze, there are cleaners available. Check with the OEM for any coolant additive requirements. Also coolant in the oil is someting to look for.

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Q: What are reasons for contamination in the coolant system of a diesel engine?
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