The OEM specific oil will always differ from normal oil. The OEM oil is tailor made specially for them.
Any oil manufacturer who manufactures its oil with third party, always gives them the guidelines on how to make the oil as per their requirement.
The oil has to turn black within few kms of running. This is an indication that, the oil is doing its job properly. A black oil does not mean it has lost its properties.
Also, the HH 10W30 oil is being made by two companies BPCL and Tide Water. Check the retail 10W30 oils of these companies and you will surely notice some difference than the OEM spec oil.
Cheerz!!


But hey, please justify the piston clearance issue if there is no loss of oil even after 3000 Kms.

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