Should you ever use engine flushes?

Never use an engine "flush."

Instead use a fully synthetic oil.

This is what Castrol oil means by "Un-lock the power"

After your first oil change of using synthetic oil, it will clean out the conventional oil.

Thus also why it cost more for synthetic oils.

Yes, you should use an engine flush if you have been naughty and used conventional oils or waited too long between changes. There are many on the market. The best one I've ever used and I enodrse this personally, is butyl cellosolve. What kind of engine are we writing about here?? It makes a difference. Also, the age and mileage is importatnt, too. Remove your oil filler cap and flip it over. Is it dark brown or gooey or flaky or dry? Whatever you see here is exactly what the entire inside of your engine will look llike. Just changing oil will never remove any deposits that are already built up inside. They should be removed chemically. Worst case scenario, dissassemble engine, clean, and re-assemble. Driving your car with butyl cellosolve in it for two days will usually remove just about anything. Your filter will pick up the dislodged crud, and the engine will be prepared for the installation of a good synthetic oil, like Mobil One. You can find butyl cellosolve at a Mercury boat store under the name "Power Tune". It is thorough and gentle at the same time. Good Luck.

Some of that stuff is just "Snake-Oil" and can do damage. DO NOT USE KEROSENE. If your oil is already low, or if you drain some out, put up to 1 Quart of Automatic Transmission Fluid in for a while before an Oil change. It's very similar in composition to oil, but has a higher detergent level which will help clean out varnish and sludge.

Edit; You are talking Oil, right? If you mean coolant, use Prestone flush.

Engine Flush =Gasket warper/dissolver.

We used to fill the crankcase to the full mark on the dipstick with kerosese and idle it til it got hot and then drained it and put in fresh oil and filter.

your talking about motor oil flushing?. you can flush out the crankcase, if your engine isnt too dirty, but if its pretty dirty, you should take the oil pan off and clean it out, preventing the oil pump to become clogged.i used it before, i found (gunk)is pretty good.

If you change your coolant every five years, & flush it with fresh water, install new antifreeze, you'll never need engine flush chemicals.

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Haha, they are not nessesary, look it up online, you will find its a waste of money. Your service advisor gets xtra cash when they sell you one.