Understanding carbonaceous deposit formation resulting from engine oil degradation

With increasing pressure on engine oil manufacturers to extend oil drain intervals and reduce fuel consumption, whilst changing the composition of fully formulated oils to meet new CEC, ILSAC and OEM specifications, there is ever increasing need to understand the effect of oil degradation on the operating conditions and tribological performance of engines. This poster presents mechanical changes made to a single cylinder research engine to enable the study of lubricant degradation, its transport and how this links to piston assembly tribology. A summary of the research undertaken using these changes and a sample of results obtained to date are also presented.

Download Full-text

Comparing oil condition in diesel and gasoline engines

Industrial Lubrication and Tribology ◽

10.1108/ilt-10-2019-0457 ◽

2020 ◽

Vol 72 (8) ◽

pp. 1033-1039

Author(s):

Adam Agocs ◽

Serhiy Budnyk ◽

Marcella Frauscher ◽

Bettina Ronai ◽

Charlotte Besser ◽

...

Keyword(s):

Design Methodology ◽

Engine Oil ◽

Base Number ◽

Oil Degradation ◽

Special Issue ◽

Maintenance Strategies ◽

Content Type ◽

Gasoline Engines ◽

Total Base ◽

New Generation

Purpose This paper aims to compare the conditions of in-service oils from diesel and gasoline engines, with focus on nitration. Design/methodology/approach Oil conditions of seven engine oil samples from five diesel-fueled vehicles and nine oil samples from eight gasoline-fueled vehicles with total mileage ranging from 13,600 to 30,000 km were determined via Fourier-transform infrared spectroscopy as well as neutralization number (NN) and total base number titration. Findings Chemical deterioration was characterized by significant differences in oxidation, nitration, NN increase and residual aminic antioxidant contents. Social implications Submitted in connection with the Special Issue, “Young Tribologists – Insights into the work of the new generation”. Originality/value Uncovering differences in the oil degradation of oils from gasoline and diesel engines enables improved condition-based maintenance strategies and the prediction of oil condition dependent tribological performance.

Download Full-text

Correlation Between Engine Oil Degradation, Tribochemistry, and Tribological Behavior with Focus on ZDDP Deterioration

Tribology Letters ◽

10.1007/s11249-019-1176-5 ◽

2019 ◽

Vol 67 (2) ◽

Cited By ~ 8

Author(s):

Nicole Dörr ◽

Josef Brenner ◽

Andjelka Ristić ◽

Bettina Ronai ◽

Charlotte Besser ◽

...

Keyword(s):

Tribological Behavior ◽

Engine Oil ◽

Oil Degradation

Download Full-text

The Tribological and Chemical Analysis of Top Ring Zone Samples of Fully Formulated Oil Taken From a Four Stroke Gasoline Engine

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-64076 ◽

2005 ◽

Author(s):

Peter M. Lee ◽

M. Priest ◽

M. S. Stark ◽

J. J. Wilkinson ◽

J. R. Lindsay-Smith ◽

...

Keyword(s):

Steady State ◽

Chemical Analysis ◽

Piston Ring ◽

Gasoline Engine ◽

Tribological Performance ◽

Operating Conditions ◽

Engine Oil ◽

Oil Degradation ◽

Reduce Fuel Consumption ◽

Work Samples

With increasing pressure on engine oil manufacturers to extend oil drain intervals and reduce fuel consumption, whilst changing the composition of fully formulated oils to meet the new CEC, ILSAC and OEM specifications, there is an ever increasing need to understand the effect of oil degradation on the operating conditions and tribological performance of engines [1]. This work samples oil from the rear of the top piston ring of an engine during the first 15 minutes from cold start and operating at steady state under three different loads. These samples, used 40 hour sump oil and fresh oil have been subjected to tribological tests and chemical analysis.

Download Full-text