Oil Compatibility Question

[john108]

My engine was broke in on a dyno using Comp Cams 10-30 break-in oil.
Now the engine is in the car and I am going to fill it with Valvoline VR1  20-50 Oil.

Question: Can 1 or 2 quarts of the Comp 10-30 break-in oil be included with the VR-1 Oil.
Is it bad to mix the oils?

[flyinlow]

If you where out on a road trip and found yourself low on oil I guess mixing oil would be better than low or none. However in this case I would stick with the same oil.

Did the 10w-30 not give enough oil pressure during break in?  20w-50 is pretty thick stuff.

[john108]

The oil pressure was fine during break-in, but this site recommended the 20-50 for my 505.