I changed to Motul 3000 15w20 yesterday and the idling rpm now dropped down to 1000 from 1300. Also when engine is hot it idles at 1500 instead of 1800. Is this due to the thinness of this oil (VI15 instead of VI20)?? The AFR screw is not touched at all. Also I read somewhere that using thinner oils (10W30 for 10W40 etc) increase the FE in Asian climates (generally hot). It it so??
Also correct me if I am wrong, esters have detergent properties (ie washing away deposited carbon/hydrocarbon sludge), so di-esters should have better detergent properties that single esters and thus would keep engine cleaner.


in case of first service, just tell the svc guy that you have changed the oil few days ago and wont change the oil now...and if they asks which oil, tell its bajaj dtsi... Svc create trouble only in 1st servicing.... I service my bro's pulsar from my local svc and they dont mind what oil is used...they know he uses 300v... No warranty issus so far... And changing to 15w50 from 20w50 will void warranty..again if svc comes to know... Its better to use 15w50 than 20w50... Even better if you can find 10w50... Lower the front number better it will start when engine is cold... 




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