Diesel fuel used for engine flushing, ok? - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 03-22-2011, 08:46 PM Thread Starter
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Diesel fuel used for engine flushing, ok?

a mechanic told me of the feasibility of using diesel fuel for flushing 300D diesel engine before change oil...This idea is really economical than using commercial oil for flushing..is it ok? any possible danger on the engine? please help. thanks.

Last edited by amarbenj; 03-22-2011 at 10:53 PM.
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post #2 of 5 (permalink) Old 03-22-2011, 11:19 PM
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I wouldn't recommend it. Just change the engine oil and filter regularly.
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post #3 of 5 (permalink) Old 03-23-2011, 03:30 AM
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Diesel fuel does not lubricate, so if things go wrong, you kill the engine... not quite a typically economical outcome

What is the reason for being concerned about flushing the engine?
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post #4 of 5 (permalink) Old 03-23-2011, 03:33 AM
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Absolutely not. Diesel is a solvent. Not only will it eat your seals, but it's not a lubricant. Simply put.. if you mess up it is akin to having water in the oil or diesel in your glass of orange juice.. its nawt fun
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post #5 of 5 (permalink) Old 03-23-2011, 08:06 AM
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The "sub-pan" is made for this purpose, remove it and physically clean it. check the oil pump intake screen too.

For the cost of time and a sub-pan gasket. it is the only way.

If you really want to, you can remove the valve cover and clean from the top to the bottom. I have done solvents and finish flushed with water. Yes through the motor, getting all the pooled oil from the valve area including the oil in the hex bolts.

After water flush spray with WD40 this is what is it good for.

Allow to dry for a few days before re-filling.

Warm-up the motor and have clean oil.

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