is Rejendra Petkar of TATA correct--?

[steve20]

--or is he making a play on words here
He states:
Speaking on oil consumption, Petkar observed that besides selecting low volatility base oil components, optimum viscosity also has a key role, as higher viscosity oils form thicker oil films, resulting in higher evaporation loss.
Reference:

https://fuelsandlubes.com/fli-article/lu...conomy-mandate/
The censored part of the link is [censored] ---believe it or not---
OK, censored again--c'mon guys loosen up a bit--if interested in reading article on the link use the first letter of the next 2 words: blue sky
Steve

 

[L_Sludger]

Originally Posted By: steve20
--or is he making a play on words here
He states:
Speaking on oil consumption, Petkar observed that besides selecting low volatility base oil components, optimum viscosity also has a key role, as higher viscosity oils form thicker oil films, resulting in higher evaporation loss.
Reference:

https://fuelsandlubes.com/fli-article/lu...ies-for-indias-[censored]-vi-and-fuel-economy-mandate/
The censored part of the link is [censored] ---believe it or not---
OK, censored again--c'mon guys loosen up a bit--if interested in reading article on the link use the first letter of the next 2 words: blue sky
Steve
Briggs & Stratton condensed to the first letters of the two words in the marque's name.

 

[BrocLuno]

Entirely dependent on the nature of the base oils in question ... Group I & II maybe (and I'm sure there is much of that in India ...).

Group II+, III and above, not very likely

 

[steve20]

thanks Broc--wouldn't it be logical to think for 2 oils with the same NOACK, the higher viscosity oil/thicker film would lead to less evaporation loss?
Steve

 

[BrocLuno]

Sure, as discussed many time over in HDEO forums, high viscosity oils almost always have lower NOACK and vapor losses. It's the 5 grade with a ton of VII's so it can make the 5W-30 rating that will boil off like blood in outer space

Many, many trucking companies run 25,000 mile oil changes on big rigs with good old Grp II+ like Delo400 and get good UOA's. No excess thickening due to light hydrocarbon losses.

Many auto MFG's call for heavier oils when the cars are going to be tracked with the associated higher sustained heats. Even though they know that the fluid friction will go up and add to the heat load, they want film thickness. Mobil1 15W-50 anyone