In my cloud i came across these pictures that i made 5 years ago while changing the timing chain on this engine.
Its a european market small opel 1.2 4 cylinder 16 valve normaly aspirated engine in a small 3 door hatchback.
This car had 98k miles when i made the pictures. It was 12 years old back then so about 8k miles a year.
I guess this car was mostly used for shorr trips because i know there was also yellow sludge in the valve cover.
With short trips and no real hard driving the oil never reaches it temp to vapour of the gasoline and cold start moisture vapours. I think they are mostly resposible for the varnish you see here.
Dont know about the oil changes but i am guessing every 2 years or so so around 15k miles. That is too long with short distance driving, then you should stick to extreme interval oci.
Its a european market small opel 1.2 4 cylinder 16 valve normaly aspirated engine in a small 3 door hatchback.
This car had 98k miles when i made the pictures. It was 12 years old back then so about 8k miles a year.
I guess this car was mostly used for shorr trips because i know there was also yellow sludge in the valve cover.
With short trips and no real hard driving the oil never reaches it temp to vapour of the gasoline and cold start moisture vapours. I think they are mostly resposible for the varnish you see here.
Dont know about the oil changes but i am guessing every 2 years or so so around 15k miles. That is too long with short distance driving, then you should stick to extreme interval oci.