The Application of Response Surface Methodology in the Investigation of the Tribological Behavior of Palm Cooking Oil Blended in Engine Oil

Table 6

Experimental design and results (uncoded factors).

Experiment	Speed (rev/min)	Load (kg)	Volume composition (%)	Coefficient of friction (µ)	Specific wear rate (mm^3/Nm)
1	300	5.5	10	0.09103	0.89984
2	300	2	5	0.26564	0.07589
3	200	9	5	0.06056	0.85635
4	250	2	10	0.23418	0.33661
5	250	5.5	5	0.09542	0.46867
6	200	5.5	10	0.09566	0.79715
7	250	9	0	0.06079	0.86458
8	250	2	0	0.25055	0.77947
9	300	5.5	0	0.09118	0.72354
10	300	9	5	0.06097	0.83164
11	250	5.5	5	0.09542	0.88928
12	250	9	10	0.06089	0.97986
13	200	2	5	0.26146	0.74241
14	200	5.5	0	0.09293	0.68133
15	250	5.5	5	0.09563	0.88928