Experimental Comparison of the Effect of Using Synthetic, Semi-Synthetic, and Mineral Engine Oil on Gasoline Engine Parts Wear

Table 8

Oil analysis results for viscosity, TBN, and flash point at the second and third stages.

Oil statues		Fresh oil	Used oil
Stages			Stage 2 @ variable load 2			Stage 3 @ variable load 3
Operation hours × 100		0	10	11	12	13	14	15
Mineral oil	Viscosity@40°C (cSt)	109.9	89.0	79.5	106.4	107.3	134.4	115.9
	Viscosity@100°C (cSt)	13.8	13.3	12.5	13.6	15	16.42	14.64
	TBN (mg KOH/g oil)	13.5	8.1	7.3	6.9	6.7	6.4	6.1
	Flash point (°C)	220	180	164	210	210	222	222
Semisynthetic oil	Viscosity@40°C (cSt)	125.6	79.2	78.8	78.2	81.43	93.04	91.69
	Viscosity@100°C (cSt)	15.2	12.3	12.2	11.6	12.01	13.32	13.1
	TBN (mg KOH/g oil)	13.2	9.4	8.7	8.3	7.6	7.1	6.4
	Flash point (°C)	250	190	205	196	178	212	218
Synthetic oil	Viscosity@40°C (cSt)	103.33	87.6	74.4	73.9	74.19	84.31	79.82
	Viscosity@100°C (cSt)	15.46	14.9	13.2	12.1	9.98	12.28	12.9
	TBN (mg KOH/g oil)	13.19	8.1	7.9	7.6	7.4	7.1	6.8
	Flash point (°C)	228	194	180	192	172	206	212