Hi all.
Is it true that if you change from a 10w40 synthetic blend to a 5w40 synthetic you will burn even more oil (considering that the engine already burns oil with a 10w40)?
I'd like to try 5w40 synthetic because:
1-It's better for the engine (it's in the manual as one of the possible grades to use)
2-It can withstand a longer OCI.
3-I will experience low temperatures in the winter, so the lower flow resistance will be awesome.
I've read that the 5 grade means it's a thinner oil but I've also read that that is meaningless and the grade only means how well it flows at cold.
Ive also read that a synthetic will clean up the engine so well that it can damage the oil pump with all the debris it gets.
I wouldn't mind the same oil burn as now, but not higher.
The engine in question is 110.000 miles and, as far as I know, has always used 10w40 synth blend. It is currently burning around 2.5 liters in 6000 miles. First oil change was worst, as it burned aroung 4 liters in 600 miles.
Before I bought it, the car was almost non used, as it was only driven for aroung 8k miles in 4 years.
Here are the specs of the oil I've used in the last OCI (BP VISCO 5000 10W40):
10W-40
Relative density at 15ºC ASTM D4052 g/ml 0,873
Kinematic viscosity at 100ºC ASTM D445 mm²/s 14,2
Kinematic viscosity at 40ºC ASTM D445 mm²/s 95,0
viscosity, CCS -25ºC(10W)ASTM D5293 cP 5880
Calcium ASTM D4951 % weight 0.226
Phosphorus ASTM D4951 % weight 0.093
Zinc ASTM D4951 % weight 0.103
Viscosity index ASTM D2270 - 154
Fusion point, v.f. ASTM D93 °C 189
Sulfatated ash ASTM D874 % weight 1,05
Total Alcalinity, TBN ASTM D2896 mg KOH/g 8,0
Freeze point ASTM D97 °C -36
Is it true that if you change from a 10w40 synthetic blend to a 5w40 synthetic you will burn even more oil (considering that the engine already burns oil with a 10w40)?
I'd like to try 5w40 synthetic because:
1-It's better for the engine (it's in the manual as one of the possible grades to use)
2-It can withstand a longer OCI.
3-I will experience low temperatures in the winter, so the lower flow resistance will be awesome.
I've read that the 5 grade means it's a thinner oil but I've also read that that is meaningless and the grade only means how well it flows at cold.
Ive also read that a synthetic will clean up the engine so well that it can damage the oil pump with all the debris it gets.
I wouldn't mind the same oil burn as now, but not higher.
The engine in question is 110.000 miles and, as far as I know, has always used 10w40 synth blend. It is currently burning around 2.5 liters in 6000 miles. First oil change was worst, as it burned aroung 4 liters in 600 miles.
Before I bought it, the car was almost non used, as it was only driven for aroung 8k miles in 4 years.
Here are the specs of the oil I've used in the last OCI (BP VISCO 5000 10W40):
10W-40
Relative density at 15ºC ASTM D4052 g/ml 0,873
Kinematic viscosity at 100ºC ASTM D445 mm²/s 14,2
Kinematic viscosity at 40ºC ASTM D445 mm²/s 95,0
viscosity, CCS -25ºC(10W)ASTM D5293 cP 5880
Calcium ASTM D4951 % weight 0.226
Phosphorus ASTM D4951 % weight 0.093
Zinc ASTM D4951 % weight 0.103
Viscosity index ASTM D2270 - 154
Fusion point, v.f. ASTM D93 °C 189
Sulfatated ash ASTM D874 % weight 1,05
Total Alcalinity, TBN ASTM D2896 mg KOH/g 8,0
Freeze point ASTM D97 °C -36
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