Engine oil flush

[NuffNuff]

Hi guys.

I change my oil ever 5,000km with either penrite 10 (racing) or royal purple.

Now I have a heap of half litres sitting around. Some are different weights etc. Are these OK to mix (all are full synthetic) to use as an oil flush and then empty and fill as per usual?

 

[Guest]

I cant see why not. Alot of people use a cheap oil fill it up let it run for 5min then dump it and put their good stuff in

 

[GMan]

Yeah, it's fine.