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Hi guys as i said ,few time ago i made an oil change,and wheni took off the oil from engine it was very black and i see little pieces of dirty...now with NEW oil my meckanic says to me ,when he open the engine for adjusting starter,that this oil is so dirty!!! :rant: :rant: Like an old oil he says i have to change oil another time cause the motor have old dirtyinside...
NOW my question is i buy a cheap oil (like car 20 w 50) to wash the engine inside and pt in new good oil or buy new good oil directly??
Many Thanks
Piero

it`s not necessary to use an expensive oil for just flushing. There`a also some special cleaning fluids to flush the engine. Fresh oil alone will not remove any deposits in the engine.

http://www.techshop-ets.com/ts805/ts80518.htm

Piero,

The dirt may not be in the engine. It may come from running the engine in the form of blowby or other combustion junk getting into the oil. Heat is also a real oil killer.

jcslocum wrote:The dirt may not be in the engine. It may come from running the engine in the form of blowby or other combustion junk getting into the oil. Heat is also a real oil killer.

+1......My Harley has lots of blow-by (has 92k miles on it), and the oil is always dirty. One of the reasons that I change it every 2000 miles is because of how dirty the oil gets......also remember that you never totally remove all the oil when you do an oil change, so you are mixing some of the old, dirty oil with the new stuff.

Desmo_Demon wrote:...also remember that you never totally remove all the oil when you do an oil change, so you are mixing some of the old, dirty oil with the new stuff.

Why ???
Ciao

persempre907 wrote:

Desmo_Demon wrote:...also remember that you never totally remove all the oil when you do an oil change, so you are mixing some of the old, dirty oil with the new stuff.

Why ???
Ciao

You have small amounts that are puddled in various parts of the engine (heads, oil sump/crankcases), and you also have oil in your oil lines and the oil coolers that is not drained when you replace your oil. This old oil, especially if fairly dark and full of contaminates, will change the color of the new oil in a few seconds of the engine running.

You need old oil puddled when you change it!
otherwise, when you start the engine it should run for sometime WITHOUT oil in crank and in heads (I said "EEK!!!")
Paso has a very strong engine,but...

You need old oil puddled when you change it!
otherwise, when you start the engine it should run for sometime WITHOUT oil in crank and in heads (I said "EEK!!!")
Paso has a very strong engine,but...

I bought a Paso that has sat a lot, and I had no idea when the last oil change was. So I did an oil change with filter and ran it for about 75-100 miles. Then did it over all again. I think that's a good idea for any bike, especially one that has been sitting. That might help you with your "dirty oil" situation to help you find out if there's a problem.

I doubt that new oil only will remove the sludge that builds up in some parts of the engine. It will only wash out some loose stuff.

G.

Perhaps so, but my point was to not just run it briefly with a solvent.

If you prefer:

Use a commercial solvent according to the directions, drain that, change the oil, run it for 75-100 miles, then do another change. Then see where you stand.

Use less expensive oil on the intermediate change if you wish to save a little money.

Wow!! thanks guys for the advice
the one part i don't understand is FLUSHING ,what you mean?
how can a motor can be washed inside???

found in the internet:

Should you Use Engine Flush?
Engine flush is special solution that helps to remove deposits and coating from internal engine parts right before an oil change. It's useful if your engine is slightly dirty inside. But, if there is too much carbon buildup (indicated by the arrow in the photo) inside the engine, flushing may have bad effect, because washed off carbon particles may clog the oil screen in the crankcase oil pan, which may cause a lack of oil pressure.

So, how do you decide if you should use an engine flush solution? If you notice, that the engine oil becomes too dirty (dark - brown color) even in few days since you've changed it, it means your engine is too polluted inside, like the one in the image. In such case you'd better avoid engine washing off. But if you notice, that even after 2000 - 3000 miles since last oil change the engine oil remains translucent or slightly brown, it means your engine is clean inside. So, you may apply the engine flush facilities successfully.


I read between the lines that when flushing the engine you should of course clean the oil screen and also change the oil filter after that.
I don`t think that our engines look so bad inside as some car, truck or marine engine with high milage. Seen in my own engine there was rather oil sludge in it than carbon buildup. In this case engine cleaners help. One may also consider to flush the engine, then do the next oil change after a short period maybe using some cheaper oil for this. Or flush every couple of years to keep it clean. (which shouldn`t be necessary with regular oil changes)
If the engine is in too dirty condition better not flush it.