Engine Oil Evaluation Tests

Wear experiments have been carried out on a three-roller-on-ring machine. Some characteristic correlations (ATAN) of the deteriorated engine oils used in the wear experiment are summarized in Table 6.9. An effect of deterioration of petrol engine oil on wear was that an increase in the total acid number of the deteriorated oil above an initial value had a definite correlation with wear of steel. 

Similarly, the decrease of TBN is more dramatic forNl, Fig. 6.10 (b). This can be observed with data determined by the HC1 (ASTM D664) method and the HC104 (ASTM D2896) method, though they are quantitatively different. 

The case study 2. Evaluation of ZDDP (primary, secondary) with R-group chain structure (long, medium, short) in oil formulation was done during the field tests. The various aspects of valve train wear performance of lubricating oils through field testing in a passenger car vehicle were compared with laboratory data (Smolenski and Kabel, 1983). 

ZDDP chain codea short (S), medium (M), long (L), primary (p), secondary (s) 

Oxidation Induction time by differential scannig calorimetry  

---