Effect of time in service on the Oxidative Induction Time of Shell Rumula X diesel lubricating oil


  1. Hiltz, J.A.
  2. Keough, I.A.
  3. Haggett, R.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Problems with the auxiliary diesel engines on CF Ships, specifically carbon build-up on piston heads, resulted in a systematic study of the engines in an attempt to determine the cause. Analysis indicated that the lubricating oil was suffering from a severe fuel dilution problem. Low load engine operation was thought responsible for these problems and a number of fixes were made. These included the introduction of low load injector nozzles, increasing the engine cooling temperature, raising the charge air temperature and increasing the turbo speed. However, the carbon build-up problem persisted. The lubricating oil used in these engines, MIL-L-9000H(1), was identified as a potential contributor to the carbon build-up. In particular, the oxidation stability of the oil was questioned. A study of the oxidative stability of the oil (2) indicated that MIL-L-9000H, the oil specified for the propulsion and auxiliary diesel engines on CF Ships, exhibited less oxidation resistance than several commercially available SAE 40 diesel lubricating oils. In this paper the results of a study of the oxidative stability of Shell Rimula X diesel lubricating oil following service in four diesel generators on HMCS Vancouver are reported.
Report Number
DREA-SR-2001-094-SES-VIII-PAP-38 — Special Report
Date of publication
01 Oct 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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