Last night, I did an oil change on my 2011 Prius - which just turned 90k.
The car calls for 10k intervals on 0w-20 synthetic.
Early on its life, the oil was still fairly clean towards the end of the 10k intervals.
During yesterday's oil change, it had only been 8500 miles and the oil was extremely filthy. I do not recall seeing it this dirty before.
One thought is that the super dirty oil is due to an increased amount of blow-by that is caused by the engine's age/mileage. I was once told that as engines get older, the ring seal deteriorates and more blow-by is common.
Given the mileage on this engine, should I consider a shorter interval due to the increased amount of blow-by? Does anyone else practice a shorter oil change interval after a certain point?
Thanks
The car calls for 10k intervals on 0w-20 synthetic.
Early on its life, the oil was still fairly clean towards the end of the 10k intervals.
During yesterday's oil change, it had only been 8500 miles and the oil was extremely filthy. I do not recall seeing it this dirty before.
One thought is that the super dirty oil is due to an increased amount of blow-by that is caused by the engine's age/mileage. I was once told that as engines get older, the ring seal deteriorates and more blow-by is common.
Given the mileage on this engine, should I consider a shorter interval due to the increased amount of blow-by? Does anyone else practice a shorter oil change interval after a certain point?
Thanks