engine flush.

[to v or not to v]

i have some Wynns engine flush in the garage. has anyone used this, or similar?
is it just snake oil?

i have to remove the oil, when i get round to checking the clutch. so im wondering, is it worth putting in the ace's old motor?
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current bike Yamaha Thunderace.
Moto Guzzi V7.

[stinkwheel]

Nah. Old engines used to have no detergent in the oil and just a gauze screen filter so any particulate material would form a sludge in the bottom of the sump which you then flushed out.

Modern engines have detergent that keeps the particulate in suspension and it's then caught and removed by the oil filter.

If I've ever drained oil that seemed particularly filthy, I filled with cheap oil then did a short interval oil and filter change after a couple of hundred miles.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[uberkron]

don't put it in your engine.

I've seen mostly bearing damage from a blocked oil pickup, and sometimes every seal on the engine swells, deforms and leaks.

I get it free from oil suppliers. good for keeping waste oil tanks flowing but not much else.

find a manufacturer that endorses it. my info tells me only use oil in crankcase. no solvents.

when I was younger and dumber it cost me a few engines.
so I think it's a poor idea.
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i ride a zip 50 2smoke. It overtakes a hundred times a day.

[Robby]

I have never come across a motorcycle engine with a serious case of sludge. If they get left that long between oil changes, it's far more likely that the engine will burn off its oil and seize.

I have come across it in one car engine that had done about 30k miles without an oil change, just topups. Even then, most of the sludge was in bits that are not submerged in oil - the top of the rocker covers were particularly nasty.

It's more of a holdover from the very old days of basic oils, lots of cast iron, and not much performance.

[MCN]

It won't harm anything in the engine.
If I had any concern that an engine needed flushing then I would pour Wynns engine flush into it before a service.
Go for a run to warm the engine, pour it in, run it for a bit then drop the oil.

Anything in the sump has to pass through the screen then the pump then the filter before it gets to the engine.

What certainly can rain on your parade is pre-filling an oil filter before fitting (if that is even possible). The little bit of risk is dirt bigger that what the filter is designed to trap is introduced to the downstream side of the element. From a Dirty filler can or woteva.
I just crank the engine over. The oil pressure is there after it fires. The parts of the engine that need oil will have plenty of oil on them anyway. The trick is not to rev the fukin heid off it until oil pressure is up. That means there will be negligible potential for harmful loading before oil gets into it's position.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.