xantia xu10j4r engine break-in oil

[saeedm]

hi guys. what type of oil is good to use in engine break-in period?
engine is Xu10j4r
and i just finished engine overhaul and everything is in minimum factory clearance range including crankshaft bearings clearance and cylinder wall to piston clearance.

can i use normal SAE30 or SAE40 normal mineral oil for first 20 min run?

[CitroJim]

I'd just use your normal, preferred oil and then drain after your initial run, change the filter and refill...

I don't believe running-in (break-in) oil has been used for years now...

[saeedm]

normally i use synthetic or semi-synthetic oil
But synthetic oils seem to glaze cylinder wall cross hatch.
+ i have used MAHLE pistons and rings and im sure that they will not be as good as OEM ones
i kinda dont want to mess it up, i want go careful

[CitroJim]

In that case, initially use a good quality mineral oil...