Mercedes Benz C300: Usual Troubles
The Mercedes Benz C300 has luxury written all over it. But even with its delicate features and curves, this sedan keeps a tiger under the hood. It can run like an animal in the wild with unbridled speed. It packs a powerful engine that can supply the needed horsepower and torque for spirited driving on the road. But even if its interior is built with opulent materials and its exterior looks solid, a few years down the line, the C300 sedan will reveal its flaws and glitches. We have here a short list of common C300 problems.
Driveshaft vibration/excessive movement
C300 owners have reported about vibrations that seem to be coming from the sedan’s center floor. These vibrations may be accompanied by some noises. The vibrations could often be traced to driveshaft flex discs that are cracked or starting to shred, causing the driveshaft to move excessively. This requires thorough inspection and immediate repair or replacement. Failure to fix this driveshaft problem may lead to a damaged bearing of the driveshaft center support, transmission failure, or differential breakage.
C300 owners have also complained about some brake problems. They hear squeaks when driving. The noise is coming from worn-out brake pads most of the time. Because of the brake pad issue, rotor surfaces may develop uneven wear. When the pads are changed, the rotors should be checked as well for grooves and other forms of damage. In some cases, the pads have to be replaced along with the rotors. The squeaks and other brake problems may be attributed to the size and material of the brakes.
Another common brake issue is the premature wear and failure of the ABS modulator assembly. Usually, this is caused by contaminated brake fluid. For preventive maintenance, the brake fluid should be flushed at least every couple of years. This will help prevent failure of the modulator and other brake system parts and can ensure better braking performance that you can enjoy for a long while. Make sure that there’s enough brake fluid stored and that the fluid is clean and of good quality.
FAQs—Mercedes Benz C300
I get this rough knocking or tapping noise from the engine for a few seconds after starting up my Mercedes Benz C300. What seems to be going on here?
The crankshaft bearing might be taking time to pressurize in your car's engine, thus the knocking sound upon startup. Apparently, Mercedes Benz admitted that some C300 engines have a weaker main bearing tolerance, which cause a noisy startup until the oil pressure builds enough to get oil between the crankshaft and the bearing. However, this condition is not damaging to your engine as long as you don't drive off in full speed until the engine has warmed up a little or around 20 seconds after start up. It is also recommended that you wait until the engine gets down to 600 RPM on idle before you put the transmission into gear. While this issue does not do any damage to your engine at all, some owners find the sound annoying. If you don't want to hear the noise anymore, you can replace the crankshaft easily.
The "Check Engine" light of my Mercedes Benz C300 is switched on. What does it mean?
It depends on how the "Check Engine" light is behaving. First, if you notice it activating intermittently, take note of the conditions whenever this happens. Determine if it turns on when you are accelerating, driving on the highway, or when you are driving slowly. Then take your C300 to the mechanic and tell him what you noted to help him evaluate the issue. Meanwhile, if the "Check Engine" light is on every time you use your Mercedes C300, have it checked as soon as you can, especially if you notice any problems in your car's performance or if you hear any unusual noise. Finally, if you see the "Check Engine" light flashing, you must stop driving your car and have it towed to the nearest mechanic. This flashing light is warning you of a serious problem with your car, and you will risk ruining the engine if you continue driving it.
Is it okay to replace my Mercedes Benz C300's stock resonator with an x-pipe? Will it affect my car's performance or will it only improve the sound?
Because the stock resonator serves as the exhaust pipe, replacing it with an aftermarket x-pipe will not affect your C300's performance both in a good and bad way. This is actually a popular modification that many Benz owners do to get a better sounding exhaust without having to spend a lot on replacing an entire exhaust system. With an x-pipe installed, your Mercedes Benz C300 will start sounding aggressive and a little raspy but only when you accelerate past the 3,500 to 4,500 RPM. Installing the component doesn't take a lot of time, too, but you will need a couple more pipes since the usual x-pipe is not long enough for the C300. Make sure that you buy one with a diameter of 2.25 inches or it won't fit. To install the x-pipe, simply take out the stock resonator then weld in the x-pipe and the additional piping.