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  #1  
Old 02-28-2000, 01:04 PM
BenzoX
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I have an 89 190E 2.6 with 125,000 miles on the clicker. All through the maintenance record it has been treated to quarts of Castrol GTX 20W-50. I myself have had the car for about a year and have put in the same 20-50 twice. Is this proper oil to put in or should I consider going to down to 10-30? It runs great so I don't think it is suffering at all with it. Just that all the cheapie (Non-Mercedes) cars I have experience with can no longer run smoothly on 20-50 because of wear.

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Rob C
89 190E 2.6
Beige
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  #2  
Old 02-28-2000, 02:00 PM
Andras Nagy
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Rob:

When I lived in Orlando and Southern California, I used 20W50 all year round, and have never had any problem with doing do. If you look at the oil weight charts, you will see that this is what the industry and auto manufacturers recommend.

Smooth running is not a function of oil weight; besides, when a 20W50 oil heats up, it is supposed to be the same viscosity as a straight 50W oil. And the higher the OIL temperature goes, the less viscose it will be. The danger with higher temperatures is that the metal parts also expand, and so you might get interference problems; i.e., your pistons can "freeze" inside your cylinders.

If you are worried about doing something that the "cheaper" cars are not doing, go to synthetic, but be aware that synthetics do not mean that you don't have to change your oil as often. They just will not break down, chemically, as easily. They still get dirty from the products of combustion, so still need to be changed.

By the way, 10W30 is for the northern part of the USA, where temperatures go lower, and do not climb as high, as in Florida. So most manufacturers and industry sources will advise to stick with the 20W50.....Andras

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  #3  
Old 02-29-2000, 12:04 AM
BenzoX
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Cool thanks for the info. The reason I say what I did about 10-30 oil is because we use it on my dad's 87 mazda and my mom's 89 cadillac and used it also on my 86 cougar I had previous. The reason we used it was because of the resistance of a thicker oil. In fact my dad's truck has sticking valve lifters and we have to add marvel mystery oil along with the 10-30 to keep them from making that annoying noise.

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Rob C
89 190E 2.6
Beige
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  #4  
Old 02-29-2000, 09:09 AM
Andras Nagy
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Rob:

Be very careful with Marvel Mystery Oil. It is a viscosity enhancer; i.e., it makes your oil thicker, and by so doing, it supposedly "masks" noises and such. What you do when you add it to 10W30 is to increase that oil to 20W50. So what have you gained?

But it is not a panacea for anything that is truly incorrect.

If you do want to use a low viscosity oil, then use a synthetic, since they will not "break down" in film strength, oil shear, or any of the other "bad" things that petroleum oils do. Notice that NASCAR, Formula One, and CART use synthetics in their racing engines, but then they are revving at maximum RPMs most of the time, and they cannot afford to have oil failures. I doubt that your engines are subjected to such loads.

So now that you are armed with some more facts, you should be able to make an informed decision which is right for you.....Andras
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  #5  
Old 02-29-2000, 03:26 PM
BenzoX
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Ok yeah I totally undersand. The marvel Mystery oil my dad uses in his truck is mostly in the gas though when he fills up the tank. It is very thin and helps penetrate and stop the tapping. I would not put something so thin in my oil.
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  #6  
Old 03-01-2000, 01:54 AM
wjbell
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I used Marvel in the gas of a non-Mercedes for a while and noticed considerable plug fowling. I used the recommended amount per amount of gas and plug life was still shortened. I don't know if this is universal, but I sure don't mess with it in the tank anymore!
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  #7  
Old 03-01-2000, 02:59 AM
BenzoX
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About that plug fowling....Is there a reason that you were using it? I certainly would not use it for no reason. Its better for when you having sticking engine parts or something.
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  #8  
Old 03-01-2000, 08:47 AM
LarryBible
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Marvel Mystery Oil is great. It has a handy spout which makes it easy to put a drop or two in my airtools before I use them. I use it for nothing else related to automobiles.


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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles
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