Re: is 10w50 from castrol good for hh cbz extreme 2008 model?

Topic Approved.


Firstly, let me clarify that tappet sounds are cuased due to their misadjustment. Try getting them adjusted by a good mechanic using a GUAGE. Using the guage is important to the last milimeter...
If the tappet settings are disturbed, oil change will not help you. So, get this settled first.


Normally speaking, the later value (of an oil's grade) is the oil's stickyness at high heat, near boiling point of water or so.

If this number is higher, the oil is more sticky, its better because it will stick to the engine, so its better, GENERALLY SPEAKING.
But again, its not really needed & we never know the ideal quantity...

Coming to the first value, it is the stickyness of oil at room temperature, that is when the bike starts. This value should be lower as the oil should ideally circulate the engine well on first crank, and not be too sticky here.

So, if a certain bike's recommendation is 20W40, then you may choose outside this range, like 10W40, 20W50 and even 10W50, but not the 10W30 because as you guessed, it won't stick at high temperature that well, causing more wear and tear. I hope I'm clear.
Your mechanic is wrong in recommending 20W40 I think, unless he hardly has any choice. I think 10W40 would be great.


My suggestion would be to get an experienced mechanic's suggestion on Tappets first, then decide.