My K has 124,000km on it and I put the gasket and updated tensioner when it had 83,000km on it. Since then it sometimes plays briefly, perhaps for less than a second. I have always used 5w30 GM oil. On 2022 i decided to use 0w20 Dexos D oil. Do you think that this oil is good? Do I need some oil addictive?
I think that this oil will make it worse since it is "water-like" and does not adhere properply on the timing chain or remain in the tensioner. As far as I know it is only recommended for the gasoline engines.