Should I Get an Engine Flush?
When your oil change place recommends you get an engine flush, should you have it done?? The answer is almost always a big NO. Not
only is it usually a waste of money, sometimes it can actually cause your engine to fail.
An engine flush involves pouring a chemical solvent into your engine and running it for a little while, supposedly to breakup and flush out old sludge.
If you've had your oil services on schedule and used the correct oil, you shouldn't have sludge and you will only be wasting your money to have it done. If you haven't changed oil often enough or used regular oil on a turbo-charged engine you probably have some. Usually the sludge accumulates at the top of the engine where most of it tends to stay there.
While you don't want sludge in the engine anywhere, you really don't want it clogging up small passages or control solenoids or plugging the oil pump inlet tube causing oil starvation to the engine. This is exactly what can happen when the solvent breaks up the sludge at the top of the engine and moves that broken up sediment around. If the oil pump inlet tube plugs up, unless you catch it in time and replace it, the engine will soon destroy itself.
Most auto manufactures recommend against engine flushes and they can void the warranty if it causes damage.
The best way to take care of a sludge problem in your engine if it hasn't already started causing problems, is change the oil more often and slowly dissolve any sludge moving around. For the price of the flush you can easily pay for another oil change. For the price of an engine repair you can easily pay to have the oil changed more often.
A mild solvent can sometimes be helpful for stuck lifters or rings in older engines but use with caution if the engine has very much sludge buildup.Oil change intervals