What I like to do from time to time is add a quart of Transmission Fluid about 3 days before an oil change, the transmission fluid has detergents that clean out any sludge from your engine. of coarse if you never change your oil and its thick as tar you may need professional help for your car.
Sludge in an engine is cause by poor maintenance. Air and contaminants build up over time to create a thick sludge throughout the engine.
sludge
Engine sludge is what the dealer told me Engine sludge is what the dealer told me
Flushing sludge from your engine is not a very smart thing to do. Almost every automotive technician will agree with that. Flushing out an engine causes all the sludge to drain down into the oil pan. Which in turn tends to plug up the oil pick up and causes engine damage.
one sing can says a lot: check in your oil cap, if you find some oil sludge, its a big revelation that you have oil sludge problem in the engine
Engine sludge formation includes, lack of proper maintenance, inappropriate oil temperature, use of an inferior engine oil, and engine oil contamination. You can try flushing it out with an oil flush additive but often times this does more harm than good.
While a V6 Passat can sludge (as can any engine), it is not nearly as common as sludge issues on the turbocharged 1.8 liter engines. The reason for the difference is that the heat from the turbo, combined with an inadequate oil capacity (under 4 liters) breaks down the oil and forms sludge. The V6 engine, being a non turbo and having a larger oil capacity is less prone to sludge. However, as is the case with any engine, prolonged oil change intervals and cheap oil/filters will increase the risk of sludgeing over time. A good site to check for more information is Passatworld.com http://www.passatworld.com/forums/
if sludge is keeping oil from draining away from valve guide a cylinder can suck in oil and cause plug to misfire
With pliers if u have sludge in your engine
Remove the oil pan from the engine and clean it with kerosene.
Without removing and disassembling the engine, Sea Foam oil treatment is a good product for this.
Probably a sludge problem.