Engine oil flush of weak/old engines, recommended or not

[umarxe]

Few people says flushing an old/weak engine can be harmful for the engine. Can anybody please explain why and how?

In fact I have Suzuki Khyber 1998 (1000cc, Petrol/CNG). Its oil change is due and I want to flush it. In fact I am feeling the need to flush because last time when its oil was changed then it was very dirty and after changing the oil when I checked new oil then even new oil too turned quiet dirty/blackish right away after change.

So want to flush the engine with Liqui Moly Engine Flush.
But engine of my car has started showing the signs of getting weak. Like it start blowing white smoke and engine oil start getting into spark plugs. Though it is not reducing engine oil yet at all. However I know sooner or later I will be going for engine overhaul.

So coming back to the topic what should I do? If flushing a weak/old eingine with such product like Liquy Moli is harmful then what is the alternative solution for me? If I don't flush then new oil will turned to dirty right away after oil change.

Please suggest what should be done.

[ahmed2396]

Do you think if oil gets dark or black in colour so its in bad condition, actually the good oils get darker because the clean the engine and if oil doesn't get darker then it will be alarming situation that oil is not doing its job properly. If you see Toyota 2C engine which 2.0D has and you see the oil, it gets jet black withen 50 km of drive because diesel oils have very strong detergents which clean and scrub engine very effectively with good amount of ZDDP. And white smoke is related to blown head gasket and oil in spark plugs show bad valve seals and oil control rings.

[epigenius]

irrespective of age flush is not necessary

[babarhyd]

Engine flush is marketing gimmick in my opinion. In my 20 years of keeping cars no car needed this. But now everyone seems asking this question.

[umarxe]

Thank you members, i saw several threads here on pakwheels about sludge and flushing the engine due to this. Few of these are

https://www.pakwheels.com/forums/engine-transmission-powertrain/190934-engine-oil-flush
https://www.pakwheels.com/forums/oil-fuel-fluids-filters/235754-engine-flushing-liqui-moly-engine-flush-additive
https://www.pakwheels.com/forums/engine-transmission-powertrain/238301-after-engine-flush

So i was thinking i should go for it. By the way actual question is still unanswered can it be the harmful for the old engine?

[babarhyd]

Thank you members, i saw several threads here on pakwheels about sludge and flushing the engine due to this. Few of these are

https://www.pakwheels.com/forums/engine-transmission-powertrain/190934-engine-oil-flush
https://www.pakwheels.com/forums/oil-fuel-fluids-filters/235754-engine-flushing-liqui-moly-engine-flush-additive
https://www.pakwheels.com/forums/engine-transmission-powertrain/238301-after-engine-flush

So i was thinking i should go for it. By the way actual question is still unanswered can it be the harmful for the old engine?

Yes. No manufacturer recommends this.

[tintin1]

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[margallar]

replace pcv valve(blow valve) and install a thermostat valve, your engine will always be clean

[ToxicDevil]

Fully synthetic oils clean the engines just like engine flush does.
Synthetic oils also have additives that maintain the seals in the engines. so there is not much of a difference bw the two.

If your car is properly maintained (optimum operating temp and good engine oils) you wont actually need to flush the engine it will already be clean.

You do not want to use flush on an old engine that has a lot of sludge deposits because you might be cleaning the deposits that are helping to create seals. You will loose compression if you clean them, effectively reducing the life of your engine even further.

[tintin1]

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[bym007]

Here is the lowdown on the engine oil (or coolant) flush.

Engine flush can be good to extend the life of an engine in certain situations.
- When engine has developed "some" sludge,
- When engine has developed some knocking etc...

Engine flush is known to cause problems in engines where engine may not have been serviced regularly. In these cases, there is a chance of oil pan flush clearing the sludge and causing some cracks or leaks in the hoses. Remember, sludge is also good to block some minor cracks and tears in the engine block and hoses. When the sludge is cleaned, these cracks and tears appear.

If the engine is old and service history is unknown and the owner wants to flush it just for "some" peace of mind, its better to put in regular engine oil and change it every 1000 kms (with regular running) for a few times. Just remember to drain the oil from the bottom of the engine (oil pan), and not from top using vacuum sucker. This will move a load of sludge without causing any existing tears or cracks to appear. By doing this every 1000 km for 4-5 times, you can bring the engine to a much better condition.

On an engine with good/known service history, most of the sludge can be cleaned, and as long as oil/filter used to be changed regularly, it will not crack or tear any hoses.

Engine flush is very unlikely to cause major "variances" between the piston cylinder head after flushing. Remember flushing can remove "some" sludge, but it can never absolutely clean the piston heads or drums. Some fine sludge can only be cleaned by opening the cylinder head and then by manual scrubbing or by using machines.

[hsumbal1]

Engine flush helps; but I believe its too late for your engine now...the engine oil is darkening fast is due to oil burning as burning oil produces more soot.

I personally think that there is no need to use fancy engine flushing agents, just pour the same oil you are using and change it after driving a 100km. In the early stage of the weakening(which your engine seemed to have gone past long while back) it does help.

A couple of quick or rapid oil changes-at 100km intervals-do help car, clearing sludge and carbon and make the rings compress better against the cylinders.

Anyway I think its time to get your car's engine overhauled, and this is the best weather to get it done. Make sure that install the thermostat valve. It is very important for the engine to reach optimum operating temperature in the winters. A cold engine wears out lot early.

[bym007]

Any update ?

Sent from my HTC One using Tapatalk 4.1.6

[tintin1]

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