5W30 oil.
10w-30 is the most common. If you can, use a synthetic. It will pay off in the long run if you plan on keeping it .
Engine oil is 10w 40
10w30 unless it is burning oil, in that case use 10w40.
Always use 10w40 ATV oil
You can use any SAE certified engine oil in your Nissan. The engine oil should be a 10W-30 weight engine oil.
If the engine is original, use standard oil. If the engine is new or has had a full rebuild, using synthetic oil will result in a longer life for the engine.
5w20 weight.
40 weight
No, absolutely not, that is the wrong weight oil for your Civic. Use 5w30 weight oil. You can use a full synthetic but use the correct weight if you want this engine to last.
What engine is it in? 305/350 V8s use 5L of 5w30 in the winter and 10w30 in the summer
A 10W-30 or 10W-40 should be fine.