Last week I spoke to Repsol distributor in Karachi and inquired about Repsol racing 4T 10w40 fully synthetic oil, according to him the oil should be used to water cooled engines oil and it was not for air cooled engines....After the discussion I wrote an email an email to Repsol Spain inquiring about it, yesterday I received there reply
Dear Mr. Chaudhry,
We are contacting you with regard to the mail in which you ask us about REPSOL MOTO RACING 4T 10W40.
We confirm you that this lubricant could be used in both kind of motorcycles, refrigerated by water or by air.
We hope we have helped you and remain at your disposal in case there is any other question.
Best regards,
Repsol Lubricants and Specialized Products
Technical Service Lubricants