Hi,
my car has now 240'000km so it's quite old but the engine runs still very fine. For the previous oil change, I have used Mobil1 5W50 100% synthetic oil thinking that the higher 50 grade would be good for my old engine. However despite this high grade the oil consumption was higher (not scary though) than it was with the oil I used previously (Motorex 5W40 synthetic blend).
I've heard it is known that when switching from synthetic blend to full synthetic, the oil consumption is supposed to grow but why? I understood this as the synthetic oil cleaning the engine and removing sludge deposits. However I did not see any leaks when using the 100% synthetic oil so the oil has not removed all the sludge that could be on the seals. Moreover why would a cleaning process make the engine to burn more oil? And why would this happen with an oil that is a 50 grade?
Now I switched back to the 5W40 synthetic blend and the engine does not eat oil anymore.
Any clue?
my car has now 240'000km so it's quite old but the engine runs still very fine. For the previous oil change, I have used Mobil1 5W50 100% synthetic oil thinking that the higher 50 grade would be good for my old engine. However despite this high grade the oil consumption was higher (not scary though) than it was with the oil I used previously (Motorex 5W40 synthetic blend).
I've heard it is known that when switching from synthetic blend to full synthetic, the oil consumption is supposed to grow but why? I understood this as the synthetic oil cleaning the engine and removing sludge deposits. However I did not see any leaks when using the 100% synthetic oil so the oil has not removed all the sludge that could be on the seals. Moreover why would a cleaning process make the engine to burn more oil? And why would this happen with an oil that is a 50 grade?
Now I switched back to the 5W40 synthetic blend and the engine does not eat oil anymore.
Any clue?