What is the best engine oil for Honda wave 125?
Fully synthetic 0w-40.
This is why.
A Honda Wave engine, like most engines today, is designed to run with an oil that has a ‘runniness’ (a viscosity) of around 12-15 C/s (centistokes. A measure of how fast it pours through a certain sized tube)
An oil with the second number of ’40’ has a runniness of 12-15 c/s WHEN HOT.
The ‘runniness’ of the oil is critical to the engine’s health. if the oil is too thick, it will not pump around the engine properly and the engine will suffer substantial wear. If it is too thin, the oil will not be able to provide a strong enough barrier between the moving metal parts and again, the engine will suffer wear.
The problem is that before the engine’s oil is hot, (depending on the numbers on the can), it may be MUCH thicker than the engine is designed to use, and then the engine will wear while it warms up. How quickly it wears depends on how thick the oil is when you first start the engine.
Remember, between 75 and 90 percent of ALL engine wear happens when the engine is first started and the oil is cold and too thick.
The science bit!
A multigrade oil has two numbers which tell us how it behaves.
The first number tells us how it behaves at 40 deg C (the temperature of a hot bath) the second number tells us how it behaves when the engine is fully hot (100 deg C)
Don’t forget, ALL multigrades behave the same at 100 deg C if the last number is the same on the can!
Even at 40 deg C, which is much hotter than ANY engine will be before it first starts, no matter how hot the day is, a straight 40 oil will be over 10 times thicker than the engine is designed to use. It will of course be correct at 100 deg C because it is a 40 when hot.
At 0 deg C it will be over 250 times too thick and take many miles ridden to drop to a safe viscosity.
When first started from cold, the engine with this oil in will suffer EXTREMELY HIGH relative levels of wear.
A 20w-40 will be nearly 5 times thicker than the engine needs at 40 deg C, It will of course be correct at 100 deg C because it is a 40 when hot.
At 0 deg C it will be over 80 times too thick and take several miles ridden to drop to a safe viscosity.
When first started from cold, the engine with this oil in will suffer HIGH relative levels of wear.
A 15w-40 will be around 4 times thicker at 40 deg C, It will of course be correct at 100 deg C because it is a 40 when hot.
At 0 deg C it will be over 50 times too thick and take some miles ridden to drop to a safe viscosity.
When first started from cold, the engine with this oil in will suffer MODERATE relative levels of wear.
A 0w-40 will be the correct runniness for a hot engine at 40 deg C. and also correct at 100 deg C . Because it is a 40 when hot.
At 0 deg C it will be just 6 times too thick, and will take by far the lowest number of miles ridden to drop to a safe viscosity.
When first started from cold, the engine with this oil in will suffer the LOWEST relative levels of wear and so last the longest.
As a bonus, all 0w-40’s are fully synthetic oils and synthetic oils are MUCH better at protecting VERY hot engines as well, remaining at the correct runniness and not getting very thin, (or worse still, breaking down entirely) if the engine is working very hard.
Therefore, currently, the best oil for a Honda Wave is a fully synthetic 0w-40 no matter WHAT temperature the weather, how long your journey or how hard your engine works .
Some 0w-XX oils have special additives to make them more slippery and so help cars be more economical Those oils may cause a Honda Wave’s oil cooled clutch to slip, so if you are not sure if the auto-store’s oil is this kind or not, buy 0w-40 motorcycle specific oil.
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