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

Table 7

Oil analysis results for viscosity, TBN, and flash point at the first stage.

Oil statues		Fresh oil	Used oil
Stages			Stage 1 @ load 1 = 50% rated power
Operation hours × 100		0	1	2	3	4	5	6	7	8	9
Mineral oil	Viscosity@40°C ST (cSt)	109.9	116.8	86.4	93.7	102.6	103.9	108.3	105.3	108.3	105.3
	Viscosity@100°C ST (cSt)	13.8	14.2	11.6	12.2	13.4	13.2	13.9	13.6	14.1	14.6
	TBN (mg KOH/g oil)	13.5	12.0	10.5	10.1	9.9	9.6	8.9	8.6	8.9	8.6
	Flash point (°C)	220	228	205	200	200	190	204	198	200	202
Semisynthetic oil	Viscosity@40°C (cSt)	125.6	95.5	82.7	84.6	97.5	94.0	92.2	98.3	99.2	99.7
	Viscosity@100°C (cSt)	15.2	12.7	11.8	11.4	13.1	12.7	12.5	13.4	14.3	14.9
	TBN (mg KOH/g oil)	13.2	11.9	13.2	11.8	11.6	11.2	10.4	10.0	10.1	10.0
	Flash point (°C)	250	222	220	219	216	204	216	200	190	180
Synthetic oil	Viscosity@40°C (cSt)	103.33	78.3	78.6	81.4	78.3	78.6	80.0	81.4	87.1	85.5
	Viscosity@100°C (cSt)	15.46	14.2	13.4	12.7	14.2	13.4	13.0	12.7	13.7	13.3
	TBN (mg KOH/g oil)	13.19	12.4	12.0	11.7	12.4	12.0	11.8	11.7	10.0	8.2
	Flash point (°C)	228	190	204	205	190	204	203	205	206	200