oil quality 1.8L

[JungloSonic]

I released about 1L oil from car accidentaly and all I had at the time was 1 L semi synthetic 5W30. I added this full litre to bring the oil midway on dip stick marking.
Will this oil cause harm to engine or timing belt? If so, I will change oil right away but I am hoping the change can be done after 2.5K at the usual 8K interval. I believe This engine takes full synthetic which is what I usually use.

 

[MarkS]

GM requires Dexos 5W30. Years ago, there were semi-synthetic oils that met Dexos. My dealer was using it, though I have always used synthetic for my own changes.

No problem, although I wouldn't stretch the oil change interval to the limit.