Oil sludge is a common problem is cars, in some cases even with correct service intervals. Google this up: "turbo engine oil" and you'll find some reads that you ought to know. One thing to know, is oil sludge cannot be filtered or separated. Problem is that it is part of the oil, exposed to high heat and chemically degraded and it sticks to surfaces unnecessarily. It is like cholesterol to the human body.

I never hear oil catch tank can catch oil sludge.   
Oil catch tank is to trap blow-by gas from reentering intake manifold.

What is “Blow-By” or is it normal for my car to have oil in the intake plumbing?

In your motor, the piston is moving up and down in its cylinder, and the rings on the piston are creating a seal so that when you ignite an air-fuel mixture, that reaction is converted into power.  As good a seal as the rings make, they will never be perfect.  What this means is that some of that expanding gas will get past the rings, and then it will be present in the crank-case.

First, keep in mind that we are talking about a very small percentage of pressure here (as long as your engine is in good running order), but that pressure still has to go somewhere.  For this reason, your car has a Positive Crank-Case Ventilation (or PCV) to release this pressure, and it will rout it back into your intake system.

There are two reasons that this is sent back into the intake, rather than being sent out to atmosphere.  The first is that Automobile manufacturers aren’t allowed to emit anything directly to the atmosphere for environmental reasons.  The second is that it can actually be advantageous for there to be a slight vacuum present in the crank-case because then there is less on the piston’s down-stroke.

However, because this air comes from the crank-case where there is a lot of oil present, this air usually has some oil vapor present in it.  This oil is also referred to as blow-by, and in moderation, it is completely normal.

https://www.facebook.com/TurboOwnersClub/po...578421665588110

Pls can help to confirm, the breather hose is before the turbo and intercooler?
IMO, blow by can cause oil droplets in mid air, and the partly the heat will boil the EO to turn it to fume. When that happens, many side effects including carbon build up on piston below piston ring, together with degraded oil additive, and in turn causing sludge.

Guys, from Preve/Saga forum, seems they talked about DEO (Digital Engine Optimizer), Racechip, ECU remap etc... anyone tried those?

As for e-throttle, or throttle booster, I am not interested.

CPS is more fuel efficient than CFE lo... :thumbs some more with less noise like the one from CVT.
Sometimes bring friends around town, they ask me how come the car like driving lorry... damn malu la.