RESULTS of both laboratory and field tests to determine causes of engine wear are presented in this paper. Among 100 passenger cars brought in for engine overhaul 57% showed excessive engine wear, were relatively free from heavy deposits, and indicated no mechanical failures.
Laboratory examination of the worn rings showed that in 90% of the cases the wear resulted from either friction or abrasion, or a combination of the two. What appeared to be low-temperature corrosive wear was observed in only 10% of the engines.
The field tests were completed with findings on the use of three different types of oil.