Engine oil consumption

Real-time oil consumption measurement on I.C. engines


DSi offers a patented methodology for on-line measurement of oil consumption on I.C. engines. This method is based on lubricant labelling using radiotracers that are representative of the distillation interval. It allows a distinction between various sources of oil consumption: engine block, turbocharger (turbine side and compressor side), and oil separator (blow-by) circuit.



The methodology offers the following benefits:

  • Real-time results
  • High sensitivity (< 0.1g)
  • Separate monitoring of oil consumption sources
  • Fast results (21-points oil consumption map within 8 hours)
  • No special fuel or lubricant required
  • No change in oil properties associated to the presence of the radiotracer
  • Selectable chain length to be labelled, from very light to heavy oil fractions
  • Both burned and unburned oil fractions are taken into account
  • The method is not affected by fuel dilution

Contribution of turbochargers and oil separator system

Reducing oil consumption of turbochargers and increasing efficiency of oil separators are important issues to reduce emissions and increase ATS lifetime.

Contribution of oil separator systems

Our patented radiotracer method allows to measure on-line oil consumption issuing from the engine ventilation system. An absolute filter is installed downstream the oil separator to collect residual oil. It offers negligible pressure losses and it is equipped with a probe that monitors oil accumulation with a sensitivity of less than 1 milligram.

Contribution of turbochargers

A separate lubrication system ("TC-Lube") containing labelled oil (radiotracer) is used to feed the turbocharger independently from the rest of the engine.  Oil leaks issuing from the turbine bearing are monitored in the exhaust line, where an absolute filter is installed. Leaks from the compressor stage are trapped in another filter installed between the compressor and the intercooler. As a result, oil consumption from both stages are measured independently.

Example: oil consumption sources in a modern i.c. engine

Oil consumption map : engine block

Example of oil consumption map performed on a gasoline engine.

Oil consumption measurement - Gasoline engine

Oil consumption map : BBY circuit (ventilation)

Oil consumption map associed to an oil separator system at 0%; 50% and 100% load.

Oil consumption measurement - BBY circuit

Oil consumption map for the turbine only

Oil consumption measurement performed on a 2L turbocharged gasoline engine.

Oil consumption measurement - 2L turbocharger gasoline engine