Running in oil for 1340

[colinworth79]

Just wondered what oil people have used on freshly rebuilt engines . Going to run up my 1340 motor I've built , new rods , pistons and all bearings. Head has been used previously. Don't want to put good oil in and the bores glaze up .

[stockcar]

either buy the cheapest basic 20w50 mineral oil you can find or get the likes of the Millers CRO 10w40 specific running-in oil

 

used both at work with good results depending on build and customers preference

[Gixer1460]

Yep - cheapest, nastiest oil from Tescos or Walmart etc. - but wouldn't use 20w-50 though as too viscous for a GSXR - only 10w-40. Run that for 50 - 100 miles and bin it with filter, then use better. Don't baby the motor either - use some revs but keep load low and you won't glaze the bores. Cheap oil doesn't have the friction reduction / long life additives and as you don't need long life , its perfect.

[Fula28]

Same as these these guys, I've always used  cheapest 10w/ 40  for 100-150 miles drain new filter ect ect. Worked a treat every time.