[shashanka]

Originally Posted by shashanka

..... (https://www.scribd.com/doc/217856475...il-Calculation), which is a fair indication of how seriously lub oil consumption is taken in the marine industry.

After submitting the above post I found (when trying to study the above link in detail) that the site needs a subscription before the full document (33 pages apparently!) is allowed access. But I think I made my point that lub oil consumption is serious business, just like SFOC is!

[sudev]

Originally Posted by blueaquan

-----
The car has already done 1.67Lakh. It has only been serviced in a MASS all these years.
Until 1.2Lakh or so, the engine was extremely smooth, but in the last 30K or so, I've had a rough noise emanating from the engine when I cross 80kmph-----

To use a popular Hindi film dialogue "bacche ki jaan loge?"

A car with that odo would have enough engine wear to warrant overhaul. Piston rings would be full carbon deposits and work. Valve stems and guides would have worn. All potential oil leakage points into the combustion. Corroborated by soot in exhaust.

Your SA is giving good advice. Overhaul can be many things including and up to half engine or fill engine replacement. MASS would typically do half engine replacement while FNG would probably rebuild engine replacing worn part with oversize one's.

[sgiitk]

At the end of the day, let us consider the oil cannot be vanishing into thin air. It must either be dropped/vented or being burned.If the first is ruled out then must be the latter. One point which is very tough to catch is the 'blow by'.

[Jeroen]

Originally Posted by shashanka

Lub oil consumption in IC engines does not seem to have such a detailed approach (at least I didn't find one after a cursory surf).

Yes, it does! If you look closely on page 2 of the link that you provided you will see that one of the main input parameters is SLOC= Specific Lubricating Oil Consumption.

Now, the question remains, is that calculated or derived from a testbed?

Jeroen