Engine cleaning solvent

The oil after long time used will be thicken then become a form like asphalt and it cling to engine inside.

The oil after long time used will be thicken then become a form like asphalt and it cling to engine inside. It will cling to inside the oil pump system and it will reduce amount pumped oil to whole of engine. That is most important thing. Nowadays, the best way to remove it is dissolution. Some types of cleaning solvents are being marketed. It’s easy to use and has high effective cleaning.

Cleaning solvent is a washy mixture as DO oil with both act as a solvent and as a foaming agent to cleaning when it heats up.

It will clean oil deposits which cling inside engine and inside the oil pump system. But it also increases pressure of the combustion chamber and spoil gasket if you throttle up. It dissolves oil and reduce the lubricating properties of oil. It’s thin so it weave into every corner to help to push all deposits out. So the first rule is forbidden to throttle up while cleaning engine.

How to use:

• Drain the old oil out of engine.
• Mix old oil with cleaning solvent according to the ratio indicated in the instruction manual.
• Put the mixed solvent into the engine with right engine oil capacity.
• Start engine and let engine works for 20 minutes with idle speed.
• Drain mixture and then change new oil filter and put new oil.

There are some youtubers, after cleaning engine, they drain mixed solvent out of engine and they see that solvent contained a lot of deposits. They say that “this cleaning solvent is really good” but they misunderstood. That is good thing but main mission of cleaning solvent is not cleaning engine, its is cleaning deposits inside oil pump system. Cleaning solvent will dissolves deposits to liquid (as gasoline dissolves paint). For semi/manual bike, most deposits in oil was created by friction of clutch disks. For scooter, clutch is out of engine so if we change oil regularly then it will not have much deposits. Some of users who used cleaning solvent for scooter and didn’t see any deposits then they said “it’s not useful” , that is wrong.

After cleaning, the remains of mixture still cling inside the engine, will it harm to new oil?

Many users are afraid of this, but I affirm “It’s harmless” if you drain the mixture completely. Because after running with idle speed for 20min, most cleaning solvent reacted, foamed and evaporated. There will be about 50ml mixture still stay in engine but it will not affect much because when the engine works and heats up, cleaning solvent will be foamed and evaporated. 

If you are particular you can do it according to 3 ways below:

Change new oil earlier few hundred kilometers. 

Put more 50ml oil to compensate for the 50ml of cleaning solvent when it is evaporated. Then change oil periodically as usual.

Change cheap oil, ride the bike for 600-800km and then change better oil.