S500 Milky oil at oil filler cap - Page 2 - Mercedes-Benz Forum
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post #11 of 24 (permalink) Old 02-16-2018, 02:13 PM
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just condensation check the oil on the dipstick
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post #12 of 24 (permalink) Old 02-17-2018, 03:04 PM Thread Starter
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Oil at dipstick looks fine - no milky residue - however, I drove the car only a few miles today. I will have oil and filter changed Monday and ask for a pressure test on the coolant system. I keep my fingers crossed!
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post #13 of 24 (permalink) Old 02-17-2018, 03:22 PM
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Quote:
Originally Posted by Nate D. Rector View Post
Not right,I hardly drive anymore,and never saw that,its a gasket,or warpped head.Heck probably time,to change timing parts,and oilers anyway.
Well................Boston is a lot colder than Tennessee. Sounds like you drive "hard" also from your profile

Could make all the difference regarding condensation in the engine.
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post #14 of 24 (permalink) Old 02-18-2018, 12:01 AM
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A very easy test would be to inspect the coolant.

If you find oil / foamy residue in the coolant, then it is for sure mixing oil with water.

Otherwise as members are suggesting it maybe nothing.
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Proudly cruising in W-140, 1998 S-500
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post #15 of 24 (permalink) Old 02-18-2018, 04:56 AM Thread Starter
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Thanks - there is nothing unusual with the coolant
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post #16 of 24 (permalink) Old 02-18-2018, 11:58 AM
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That doesn’t look normal but it is. If the oil on the dipstick is normal that is just condensation/vapors. Change your oil cap $10 at the dealer. Also drive the car more often. When I use to drive my old s500 2miles a day it was the same thing then when I started driving 60miles a day it was normal.

Would i would do is drive the car for 10 or more mile so everything is warmed up and diluted within the oil. Change the oil filter. Replace the oil cap when the seal is dry moisture builds up on the cap. Next advice is do not fill up the engine with light viscosity oils such as 30 weight. Try to stick to 40 weight but if your miles are high u might want to try 15w50
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post #17 of 24 (permalink) Old 02-18-2018, 02:24 PM Thread Starter
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Thanks. Today I had the opportunity to drive the car for about 20 miles, in part on freeways. Seems all clear now, milky residue disappeared and oil and coolant remains clear. I will anyway change all fluids and filters tomorrow to have a baseline for the future (I just got the car). My only concern right now is a slight "burned" transmission oil smell at the dipstick. Car has 64k miles and shifts normal, though. Anyway, I do not even know what oil is currently in the transmission and I do not know if the filter was ever replaced. So I will know more tomorrow.
Thanks for all the comments!
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post #18 of 24 (permalink) Old 02-22-2018, 04:46 AM Thread Starter
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I got my car back from my mechanic and he confirmed that all fluids (engine oil, transmission oil and coolant) did not show any particular concern to him and that engine and transmission are fine. Which takes a huge load off my shoulder! However, I still have two concerns that I need some advice for as I can not find answers in the archive:

1. As I smelled some "burn" odor from the transmission dipstick how can I know that there is not some hidden problem with the transmission? Any checks/diagnosis I can do? The transmission shifts fine although I hear some faint whining noise in reverse. I am probably expecting too much from a 20 year old transmission...?

2. Driving over potholes I notice a "thump" noise coming from the rear. Other than that the ride is fine. I have the self-leveling feature on my car. The mechanic states that the shocks are bad. Really? What checks can I perform to narrowing in the root cause? Is that a common issue?
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post #19 of 24 (permalink) Old 02-22-2018, 07:36 AM
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there is a test procedure to test shocks. so no need to guess if they are ok or not. I pay 5 EUR for the test every 5 years and that is it. the procedure lasts 5 minutes or less. briefly, the car is put on the track with rear (front) axis and then the machine starts with vibrations. teh response of the wheel is also measured and then the result is calculated. Scientifically. my rear shocks are still healthy after 25 yeasr and 400,0000 km. I replaced front ones not so long ago.

All I wish for Christmas is a smooth idle.
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post #20 of 24 (permalink) Old 02-22-2018, 08:30 AM
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A 23 year old car should have a owner that can do the work.Finding a mechanic that old enough to remember is hard.Be better to trade for trouble free pre 2000 honda
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