I have had it for a year and done 3 changes, but I dream at night about the sludge and skank that may be in my engine.

I know Bill R or Winfred posted pics of this issue a long while ago (- that I can no longer find here)

My question is:

If for 50k miles my 330 5 speed was serviced as per BMW specs ( )
Then I started using Motul synthetic for 3 changes, now have 65k.

What is the likelihood I have a sludge issue in there?
Is there any way to check?
Is there any additive or something to loosen that **** up before an oil change?

OR, is removal and manual cleaning the only way.

My car shows no signs of problems, but before I do another change, is there anything that can be done to help?

I was told to use oil with as many "cleaning" additives... is this going to help? My Motul has none, great lubrication, but not made with "cleaning" additives.


Suggestions?
Thank you!