I've been using the Motul 15 W 50 300V double ester engine oil since its 7500km mark.
Until the next service, the level of oil had decreased by half and i topped it up with the same oil that i had left.

But it wasnt the case after the completion of the next 2500kms. The oil level had only decreased maybe one mm on the window, thats it.

During the next service i had changed it since it had done 5000kms on the oil and the cycle kept repeating.
Now its done 15000kms..i had changed the oil at 12500kms..now the level of oil is around 75%(as the window reads).
it couldn't have been a reading error since i engage the center stand and wait for about 10mins to check the level of oil.
i occasionally rev my bike and when i do, i rev it so hard(beyond 10krpm,sometimes even 11krpm) that it begins to make a noise like it has caught cold or something and the bike feels like its going to fall apart.

My Questions are:
(1)is it normal for the oil level to decrease at this rate? since many people say that it shouldnt happen with a fully synthetic oil.

(2)if its a problem..what might be wrong with my bike?

(3)my bike has never stalled or i never experienced any knocking inside the engine...neither there are leakages from the engine nor did i ever notice any smoke from the exhaust...the AFR that i kept is just a wee bit rich..not much
so where is all this oil going to? i mean how is it that its being consumed and there is no signs of it anywhere?

(4)i only notice a significant level of change when i rev it..the change is like maybe one mm or even less but i noticed it since i use the reference of the teeth like structues inside the window...is the decrease normal?

Regards,
Gauthama.K.V.S,
Hyderabad.



.

...the oil only starts to vanish WHEN I REV...at normal speeds it isnt affected much.

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