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I think this says it all. What was everyone thinking?
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Posted by 9to5 (more from 9to5) on Sun, 30 Jan 2005 12:31:01 Share Post by Email
In Reply to: Car & Driver on recent oil sludge problems (Dec 2004)., dmz789, Sun, 30 Jan 2005 08:20:30
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Recently, Volkswagen sent a letter to owners of 1998-through-2004 Passats equipped with the 1.8-liter four-cylinder turbocharged engine informing them that it was extending the warranty on the engine to cover problems caused by oil sludge. Owners of Audi A4 1.8Ts received the same letter. Chrysler 2.7-liter V-6 engines have had similar problems, as have some Toyota V-6 and four-cylinder engines. The number of engines affected is small in each case, but in this computer-controlled age, oil sludge sounds like a Neanderthal problem.

Sludge is a thickening of the engine oil until it reaches a jelly-like consistency. When the crankcase of your engine starts to accumulate sludge, the thickened oil finds its way into the passages that carry pressurized oil to the engine's bearings and other lubricant-needy parts. Since many of these passages are about the size of a small soda straw and sludgy oil has the consistency of an icy milkshake, the oil flow can become restricted. If that happens, components such as valve lifters soon start wearing rapidly and operating erratically.

There are several ways for sludge to form in your engine. Water gets into the crankcase through condensation and blowby from the combustion chambers. Water mixed with oil takes on the consistency of thick, pus-colored foam. You'll know it if you see it.

Fortunately, small quantities of water evaporate from the crankcase as the engine warms up and the oil temperature gets above 212 degrees, which it does after a few minutes on a freeway. However, if you only drive short trips, your crankcase never gets hot enough to evaporate any accumulated water, and in such an engine, sludge formation seems certain in its future.

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