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Ooerbased detergab and ZnDTPs f m insulating bounda?y Lu-developed antiwear films, the ECR studies made clear that ficationfilms, ~l e~t , i~~l contact resistance (ECR) is t b g O T e a con-substantially different techniques from the evaporative film vmiml method of mnitm.ng boundaly jilm changes in a sliding approach now in use will be necessary to do IETS of antiwear contact. Separately, ZnDTPs and overbased detergents rapidly f m ' Ims On insulating film. In combination, however, film may f m slowly The ECR studies also showed that the secondary alkyl ZnDTP forms a highly resistive film more rapidly than the and, furthermore, may be less stable than Jilm formed by the indiprimary alkyl or the aryl ZnDTP (I). This order corresponds vidual additives. Examples of Jilm f m a t i o n by ZnDTPdetergent to the effectiveness of these materials in valve train wear percombinations are desm'bed. ECR provides no information on boundformance, a correlation that might be fortuitous. However,

111 Part 2 , the XANES spectra, the idetztrficatio~z of spectral fenttrres anrl the interpretatior~ of the resrrlts for the srrlfirr species are pwwnted. Tlre e.vperirnentc11 ~~o r k ruqrrired to ohtain the spectra is desoiberl in Pcrrt I (preceding paper). The appearance of s'" unrl s"' in tlre trihofilnzs is interpreted us evidence for disproportionorion of srrlfonute d~rritrg sliding. Iron sulfate at tlze trih o f i b~~ srrrfuce nluy be drte to srtlforzate o,vidatiotz. Basic ZDDPs fortn filnzs ~~i t l z higher S co~zcentrutiot~s tlruti do tierrtral ZDDPs. Alyl ZDDPs forn~filnrs contuitring more S than do tlrc correspotzrling alkjll ZDDPs. Most of the .srr(firr in tlre trihofilnrs is in the fornr of srrlfide. Tlre i~rcrraserl itztensities of tlre Ca++ peak is evirlent it] t/re S spectrrr anr/ corrsi.stetzt n'it/r the depositiotr of CaCo3 in the trihofilnz. Colcite trihofilti~s have heen slzo~~tz to he anti-M J~~I I : Perllcrps tlzis conzpensates for the loss in antiwear efficacy reporter1 in Part I.