Had ml 270 '02 serviced but mechanic put too much oil in. drove about 150 miles when warning light came on. brought it back and he took out excess oil out. now engine seems noisier and sounds like its rattling. also on starting when cold white smoke appears after about three seconds and again in another three. i am worried catalytic converter is damaged please tell me im wrong or that its something simple like cheap oil.
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Re: white smoke on starting engine ml270
Although mercedes recomend using synthetic motor oil im 90% sure that your mechanics mistake (putting to much oil in it) ruined your piston rings thats what the white smoke is all about!! oil is getting into the cylinders!! make him replace them for free since he caused that prblem im sure he has insurance!!
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1. As a basic measure I would make sure the correct grade and spec oil is going in the engine. You can no longer trust that a local mechanic or even a dealer service center will necessarily use the required product as stipulated by the manufacturer. It is always better to buy and supply your own so you know the correct product is being used.
2. I would not assume there is a problem with the oil pressure warning light even though there could be.
The first thing the mechanic should have done when you reported the oil pressure issue is to hook up an independent mechanical oil pressure gauge and check oil pressure when the engine is hot at different RPMs. Any oil pressure issue will usually show up at idle when the engine has been warmed up properly and the engine oil is hot (unless you have some kind of intermittent oil pressure relief valve that is sticking). Just replacing parts without actually knowing what the oil pressures are at different RPMs is being sloppy and negligent.
This is what you need to do now. Contact a business that can hook up their own pressure gauge to your engine and have them check the oil pressure readings at various RPMs when the engine is fully warm. If there is a low oil pressure issue it will show up on the oil pressure gauge. As you have a new oil pump there should be no issue now with oil volume or a sticking oil pressure relief valve which on your engine should be part of the oil pump assembly.
3. Worn engines will not be able to sustain required oil pressures. Oil pressure is not produced by the oil pump. The oil pump produces oil flow but the resistance to flow is what produces the oil pressure and that resistance is created by fine clearances between operating engine parts especially on the crankshaft and components connected to it. Once the engine wears the clearances increase and the oil flows past the parts much more easily and produces/builds much less pressure.
How well your engine with over 90000 miles has been maintained depends on how often all the owners changed the engine oil and filter , whether they kept the engine oil level up to full (most owners rarely ever check oil levels between services) and whether they always used the correct product. Manufacturer oil change intervals shown in service schedules can be 10000, 12000 miles or more which is much too infrequent for the type of use 95% of private vehicles experience which typically are on the severe to very severe use end of the spectrum. Engine oil typically needs to be changed at least at half the mileage shown in service books (at least twice as frequently) and thus at least every 5000 miles if you want your engine to last.
I had a similar experience with a 1970 Plymouth Duster, at 10 years old (1980) I flushed the engine and started running a little bit higher detergent oil and it also started smoking as you described,turned out with the engine as clean as it got the clearances of different internal oil retaining parts such as valve guides and piston rings were slightly bigger causing my engine to smoke,
When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.
Are you sure this is not the low oil pressure warning light, bet that it is. The white smoke may be from a blown head gasket, any shop can tell you just by the smell of the smoke, if it smells "sicky Sweet" then it is coolant being burned in the engine and you have big problems.
Take your car to a real shop, not one with pretend mechanics, and have it evaluated by a qualified mechanic for engine damage. It sounds like they either forgot to put oil in, or didn't tighten the drain plug or filter and you lost most of your oil. If damage is found, and the qualified mechanic states that the damage could be due to oil starvation, file a claim with Meineke. Be prepared for a runaround (hundreds of YouTube videos on these ripoff shops - Meineke, Jiffy Lube, etc).