Table 4. Averaged COF and β value for each tribotest.

Blend	Repetition 1				Repetition 2
	Avg. COF running in	Duration running in (m)	Avg. COF	β (%)	Avg. COF running in	Duration running in (m)	Avg. COF	β (%)
Plain DPG	—	—	0.1719	99.89	0.1828	1	0.1715	99.65
SiW11THTDA in DPG	—	—	0.1802	99.64	—	—	0.1714	99.61
SiW11ThepA in DPG	—	—	0.1809	99.79	—	—	—	—
THTDABr in DPG	—	—	0.1748	99.64	0.1875	1	0.1765	99.71
ZDDP in DPG	—	—	0.1909	99.70	0.1839	1	0.1626	99.24
Plain DEG	0.3325	1	0.2508	88.81	0.3164	1	0.2504	93.82
THTDABr in DEG	0.2933	1	0.2252	94.78	0.2843	1	0.2129	97.44
Plain DhL4016	0.1448	2	0.1453	99.54	0.1574	2	0.1462	99.79
SiW11THTDA in DhL4016	0.1577	2	0.1529	99.85	0.1576	2	0.1415	99.75
SiW11ThepA in DhL4016	0.1413	2	0.1426	99.86	0.1559	2	0.1415	99.61
THTDABr in DhL4016	0.1727	2	0.1426	99.78	0.1561	2	0.1486	99.92
ZDDP in DhL4016	0.1533	2	0.1435	99.62	0.1573	2	0.1431	99.73
Plain DhL4018	0.1447	2	0.1338	99.73	0.1326	3	0.1224	99.11
SiW11THTDA in DhL4018	0.1372	2	0.1241	99.63	0.1380	3	0.1260	99.51
THTDABr in DhL4018	0.1452	2	0.1222	99.46	0.1293	1	0.1134	97.93
ZDDP in DhL4018	0.1326	2	0.1227	99.42	0.1329	1	0.1213	95.38
Plain PAO8	0.5052	45	0.2242	86	0.4258	35	0.1657	66.14
SiW11THTDA in PAO8	0.3197	11	0.1194	47.71	0.3052	15	0.1214	34.95
ZDDP in PAO8	0.2041	5.5	0.1165	58.67	0.1802	5	0.1219	42.98