Originally Posted by gathermewool
Originally Posted by LeoStrop
Varnish will eventually become sludge.
Where did you read this? Not here, I hope.
Not that it will become, but although varnish and sludge are two different things, they can be the consequence of the same problem, one of them being lubricant degradation.
For me that the OCI + oil + driving habit of that engine is not optimum by looking at that picture, i would reduce the intervals. But that is just my opinion.