I've decided to retract my terrible opinion on this very insightful and wise test!
Here are the reasons I was wrong in the first place:

1. How foolish I am for not assessing the longevity and performance of my engine with a plastic bag! Daimler Benz engineers should have been doing this! They obviously had no clue how to diagnose an engine!

2. How stupidly vague oil consumption figures are! Shame on Daimler Benz , in their finite wisdom, for telling us that if an engine burns X number of quarts in so many miles, there must be an issue.

3. I thoroughly expect an engine compressing its fuel at 21 Bar to keep all of the combustion pressure and gas in the cylinders. If it can't, and is pumping it all into the bag, it must barely be running! I should rebuild my engine until it pumps nothing into the bag.

4. What if we equipped all the engines with blowbyometer bags? We would be able to judge them by how quickly the bags fill up. We should have done this sooner.

please forgive me for discounting the valuable diagnostic test!

__________________
Pierre Hedary 1985 280SEL, 1970 111.026 in progress
Mercedes technical advice hotline: 407 765 2867
[servicing older Mercedes in the state of Florida with competence and passion].

From the standpoint of an honest MB technician, Vegetable oil is a threat to your diesel engine's mechanical integrity.