oil selection and replacement?

I have 8000km of my vehicle to enter the service, should I wait for that oil change time? I saw a slight decrease, should I add a little bit myself? do you think castrol edge is 5-40 synthetic and good?

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Check from the dipstick, if it has dropped to the minimum level, you can add as long as it is the same oil, I was glad I used castrol edge 5w40 as oil for 5 years in my previous diesel 206

I don't know which oil it was before, should it be the same? and is there anything I don't know about the pole engine cover?

[QUOTE = blue42] I don't know which oil it was before, should it be the same? and is there anything I don't know about the engine cover, right? [/ QUOTE]

It is important that it be the same. If you did not know what oil it was, I would replace it completely with its filter. Yes, it will be put through the engine cover.