Poor quality oil and late oil changes, what can this cause? Check out what happened to my car below. The victim, unfortunately, was my first car. A 2008 Volkswagen Gol 1.0 that seemed to work perfectly to a layman, but driving the golzinho is when I started to notice some very strange things. With the air conditioning on, I decided to renew the internal air and turned off the recirculation function, and then I smelled a not very strange smell, actually quite familiar. The smell was from oil vapor that passes through the blow-by tube and goes to the intake manifold. I took advantage of a stop to take a look, but the tube seemed normal, however when I checked the situation in my house I noticed that the tube was held together with two plastic clamps, which is completely unnecessary, in addition to being swollen as if it were blocked. If it hadn’t been, it would have been.

So I went for an investigation, opened the air box and… surprise, the air filter expired and the box was impregnated with engine oil. The small rubber valve that retains impurities was also highly contaminated. Moving on, I removed the throttle body, also fully impregnated, although the sludge was already quite dry. I applied the decarbonizer and the sludge came out very quickly, but it is important to emphasize that when carrying out this type of cleaning, do not use the decarbonizer with the engine running, remove the body and clean manually, as a large part of the decarbonizer can further contaminate the intake manifold. , wear out gaskets and harm the lambda probe. Finally the hard part of the service arrived, the intake manifold and flame arrester were completely contaminated, but with different ways of cleaning. With the collector, I focused on using the decarbonizer to soften the carbon that was stuck to the walls of the collector, so after letting the decarbonizer act for about 10-15 minutes, I wiped it with a cloth and the carbon came out more easily, avoiding scraping the surface of the collector. excess.

After the laborious cleaning of the collector, the flame retardant came. With the hose in pieces, there was no other way, just a new one would solve the problem. The plastic ties revealed some poor work done by the previous owner. With the hose torn, the oil leaked through the flame arrester tube, the sludge was concentrated inside the flame arrester until it blocked its outlet. With less than 2l of added gasoline I was able to clean the flame arrester, however as it is a low-value part, buying a new one could be a good deal depending on the level of contamination. After cleaning, the flame arrester was reassembled together with the new hose. After cleaning all the components and assembling them, the engine worked perfectly, and the small failure and explosion in the collector ended. But then what was the cause of the problem? Undoubtedly the quality of the oil helped, as we travel to and from cities the engine is much more susceptible to oil contamination from fuel, but the quality of the oil is to ensure that it does not lose its properties so quickly in severe conditions. The old one was probably past its replacement deadline, but the other fact that contributed a lot to the oil reaching the intake manifold was the neglect of the air filter. When the air filter is highly contaminated, it opposes the flow of air to the engine, which causes it to consume oil through the anti-flame, this explains the oil in the air box, throttle body and intake manifold. As the oil was in poor condition, and after the sludge had clogged the flame arrester, the engine’s internal pressure spurted oil out through the oil dipstick. Result: Two days with the car parked, plus R$200.00 for parts and cleaning products. All this because of bad oil and lack of discipline with maintenance by the previous owner of the car.