Query Approved.

using 15w40 oil instead of 20w40 engine oil means flowing of engine oil in engine is much easier as compared to 20w40 recommendation.

the viscosity (thickness) of oil changes depending on temperature.

the number before the ' W ' is the viscosity rating for the oil in low (cold) temperatures... in this case 10W40 or 20W40.

ur bike engine oil needs to strike a balance between being thin enough for cold starts n thick enough for when ur bike's been running for quite a while n the engine's hot!



20W40 should be OK for ur Splendor!
Pune doesn't really get that cold does it.

For splendor, use HH engine oil, cheapest and also lasts very very long (6000kms with top ups every 2,000kms) !!! Don't use other grades, get simple and save money

+1 to that! HH oils work the best for their bikes!
Btw, check out the 1st few posts by Sandeep K Ram in the Engine Oils thread, they are very informative, you can get the desired info on grades, viscosity etc.

Hey i never head of this 15w40 grade, can u please provide some more info

Thanks vipin and sarvajit, but there is a small question hero honda oil and castrol activ 4t both are 20w40, apart from cost wise what are the other advantages of using hero honda oil as lots of people just follow the ad of castrol without knowing actual reason and i too been doing the same.

Hi shrinathrao,

Buddy, in simple terms as xionite has earlier posted, a 15W40 grade oil would flow better in cold conditions relative to a 20W40 oil.

But I would also like to highlight that by saying cold conditions, I am talking of temperatures way below 0 degrees Celsius, & so with the conditions in Pune hardly ever reaching sub zero temperatures of that sort, you can safely use any of the two grades available.

Also, for a little more technical info, a multi-grade engine oil is basically produced by means of a base oil (which is usually Group II or III these days for most mineral engine oils) of a particular grade/weight say 20, & then adding components known as viscosity modifiers to it to enhance the lubricating ability of the oil over a wider range of temperatures. Almost 80% is constituted by this base oil & the remaining are the viscosity modifiers, detergents, protection additives like Zn, Moly, Ph, buffers like Mg, Bo etc.

Hope this helped further.

Take care.

Happy & safe riding,
Prakhar