Car in question - 2010 Santa Fe 3.5.
It had 5w-20 for 142,000kms - - at 142,500 the exhaust CVVT actuator seals went - requiring a total exhaust sidereplacement.
Oil was changed every 6 months regardless of kms - - -usually changed between 3-5000 kms - with syn 5w-20 or 0w-20 in the winter.
My commute is a 1.5 to 2 min suburban drive to work very little highway driving. In winter it can get -30 celsius for weeks.....
Most likely a high fuel concentration - - - - The tech seemed to think that the oil had thinned down and could not protect the seal anymore, over a number of years.
I just switched to a 5w-30 - - engine is much quieter and feel smoother - - - -
I think in certain driving situations 5w-20 does not work for all engines. Like my very short tripping.
My 2c
It had 5w-20 for 142,000kms - - at 142,500 the exhaust CVVT actuator seals went - requiring a total exhaust sidereplacement.
Oil was changed every 6 months regardless of kms - - -usually changed between 3-5000 kms - with syn 5w-20 or 0w-20 in the winter.
My commute is a 1.5 to 2 min suburban drive to work very little highway driving. In winter it can get -30 celsius for weeks.....
Most likely a high fuel concentration - - - - The tech seemed to think that the oil had thinned down and could not protect the seal anymore, over a number of years.
I just switched to a 5w-30 - - engine is much quieter and feel smoother - - - -
I think in certain driving situations 5w-20 does not work for all engines. Like my very short tripping.
My 2c