what oil for engine rebuild

[toxic]

Just done an engine rebuild what oil should I put in its just got mineral oil at the mo but went out and got some 10/40 partly synthetic 4 litters for £17 Halfords sale :y:

[danny-vts]

10/40 semi synthetic :)

[xxo0pko0xx]

as above. castrol is good IMO

[trex3491]

After reading various topics on here I got my self some 5w40, running so smooth now :)

[Cam]

After reading various topics on here I got my self some 5w40, running so smooth now :)

Is what i am running on mine, top end a bit tappy though

[Ben_SaxoForte]

Is what i am running on mine, top end a bit tappy though

Running the same on mine, agree does sound a bit more tappy than 10w40