Flushing Oil

[Lucky_Lou]

When i did my rebuild a couple of years back now i stripped the engine out changed the piston rings and service items but didnt use flushing oil, im just servicing the bike ready for the coming year and wondering if it will be worth using flushing oil as its probably never been done from new. I just wondered whether or not any of our members use flushing oil and whether or not you think its worth doing.
Lou

[Barry]

Personally I wouldn't use flushing oil on a clean engine. I think the "oil guru websites" advise against it unless you have a real need. It was more commonly used back in the days of black sludge. One of the often quoted cons is that bits of sludge released by the flushing oil can block oilways or pickup screens. I have used it on a car once without problems but it didn't seem to do much cleaning.

I have read that the higher detergent levels in diesel engine oil can make it suitable for use to clean a petrol engine. Maybe the same cons apply.

[Bing]

I have had decent luck using straight diesel as a flush. At least in a Holden Gemini - 1.6l single ohc petrol engine.

My process is;
-Drop the oil
-Pull the spark plugs
-Replace the filter with a fresh one ( I just use a cheapie cause it's jis for the flush
-Fill the sump with diesel to the marks on the dip stick, high or low doesn't matter
-Crank the engine over a few times 'not too long mind' and dump / replace the diesel
-Crank the engine over again, drop the diesel, replace the filter and fill with mineral oil. Run the car for a week with the mineral then change the oil/filter with whatever your preference.

The crud this got out of my 15 yr old abused engine was frightening.

[Semper Gumby]

I would use Marvel Mystery oil.  It is a detergent that cleans the inside of a motor like new.  To help decoke the cylinders and clean out the pistons/rings I would use SeaFoam as per instructions on the 8oz or 16oz can.

Are these available in England?

Good luck.

[Lucky_Lou]

I would use Marvel Mystery oil.  It is a detergent that cleans the inside of a motor like new.  To help decoke the cylinders and clean out the pistons/rings I would use SeaFoam as per instructions on the 8oz or 16oz can.

Are these available in England?

Good luck.

Cannot say ive seen either product here but there must be similar  ones.
Lou  

[Lucky_Lou]

Decided to use STP Oil  treatment, i liked this idea as it is put in the old oil before you drain it, The instructions are to warm the engine up put in the additive and run at a high tick over for ten minutes then drain.
I was blowing a gale this morning so i just left the bike outside with a rag jamming the throttle no chance of overheating it in that wind.
There was definitely a lot of gunk in the oil when i drained it so at this point i would say it was a good thing and will do it every oil change from now on.
You can tell how windy it was by the wind sock rag.
Lou