deni
01-08-2016, 07:52 AM
Hi guys and gals.
I have an S202.082, which is a w202 wagon with M111.944 192ps 2 liter kompressor engine. The car has 480,000 km.
I got it cheap in september 2015 with about 477k km. It had been used mainly on highway journeys.
Engine was OK, MAF was shot and oily. I had all fluids and filters changed and other service like brake pads etc. I also converted it to LPG.
I cleaned the I/C by filling it with degreaser and water and let it settle for around 2 hrs then empty it. I also got a cheap ebay MAF which sprung the s/c back to life and the engine was ok-ish. It is good I didn't buy right away a more expensive MAF (BOSCH or Pierburg) as the MAF was still getting dirty. I assume there was still oil left in the pipes and s/c as I didn't get any more oil after about 2 months. I also disconnected the breather hose and let it vent in the air. I also disconnected and blocked the small vacuum tube connecting the s/c plenuum with the oil separator (based on what this guy did http://www.benzworld.org/forums/r170-slk-class/2428273-custom-air-oil-separator-why-factory.html). Strange enough, I could see some times vapor coming out of the oil separator but no oil whatsoever. There is no visible blow by from the oil dip stick or when opening oil fill cap with engine running (only some oil splattering around).
The engine was filled up to around half between min and max. IIRC oil was mobil 1 5w-40 (sorry for this I know it is important but I forgot to ask the mechanic).
The oil level remained the same for about 2 months and 2500 km. The car was used mainly in the city and max 20 km highway
The first OIL issue I experience was when returning from a trip to the seaside (~45km each way). On the way back, almost at the end of the highway journey, the yellow oil light lit for about 1 min then went off. I had been driving in 5th at around 2200 - 2300 rpm.
I parked the car in the garage and in the evening I check the oil level as I had a longer journey the next day. The oil level was very slightly below mid between min and max. Thought it must have been some sort of electrical glitch and shrugged it off.
The next day I left for a 400 km round trip journey 2/3 highway, about 30 min mountain driving rest was city and b roads. In the morning the MAF was not behaving good and it had disconnected the s/c so I was running n/a without s/c. After around 150 km after I had left home and on the highway at around 2300 - 2500 rpm the oil light lit and it wouldn't turn off. I continued for around 10 min until I had finished the highway journey and one I entered b roads (40 - 50 kph) the oil light went off. Once I entered the next city I bought 2 liter of oil and added about 500 ml to the engine. Continued my 45 min journey across the city and up the mountain. The oil light remained off. Next day was returning and 10 - 15 min after I had entered the highway the oil light turned on again. I continued the journey and the light would go on and off. Drove for around 40 km until I finished the first highway stint and added the other 500ml from the first can. Kept driving and after around 1 hour of b road and short highway stints, the light kept going on and off. At the end of the journey, I stopped for lunch for about 1/5 hrs. When I checked the oil level it was below min. I added the second liter of oil and returned home.
After that journey I have done only about 100 - 150 km of city driving so haven't checked the oil level yet.
I talked to my mechanic and he told me most probably it is the valve seals. I read a bit about the valve seals and people are saying that the most obvious thing when valve seals go bad is a plume of smoke on start up after a long rest. I haven't seen any smoke on start up or while running.
Any idea what to look for?
Thanks
Deni
I have an S202.082, which is a w202 wagon with M111.944 192ps 2 liter kompressor engine. The car has 480,000 km.
I got it cheap in september 2015 with about 477k km. It had been used mainly on highway journeys.
Engine was OK, MAF was shot and oily. I had all fluids and filters changed and other service like brake pads etc. I also converted it to LPG.
I cleaned the I/C by filling it with degreaser and water and let it settle for around 2 hrs then empty it. I also got a cheap ebay MAF which sprung the s/c back to life and the engine was ok-ish. It is good I didn't buy right away a more expensive MAF (BOSCH or Pierburg) as the MAF was still getting dirty. I assume there was still oil left in the pipes and s/c as I didn't get any more oil after about 2 months. I also disconnected the breather hose and let it vent in the air. I also disconnected and blocked the small vacuum tube connecting the s/c plenuum with the oil separator (based on what this guy did http://www.benzworld.org/forums/r170-slk-class/2428273-custom-air-oil-separator-why-factory.html). Strange enough, I could see some times vapor coming out of the oil separator but no oil whatsoever. There is no visible blow by from the oil dip stick or when opening oil fill cap with engine running (only some oil splattering around).
The engine was filled up to around half between min and max. IIRC oil was mobil 1 5w-40 (sorry for this I know it is important but I forgot to ask the mechanic).
The oil level remained the same for about 2 months and 2500 km. The car was used mainly in the city and max 20 km highway
The first OIL issue I experience was when returning from a trip to the seaside (~45km each way). On the way back, almost at the end of the highway journey, the yellow oil light lit for about 1 min then went off. I had been driving in 5th at around 2200 - 2300 rpm.
I parked the car in the garage and in the evening I check the oil level as I had a longer journey the next day. The oil level was very slightly below mid between min and max. Thought it must have been some sort of electrical glitch and shrugged it off.
The next day I left for a 400 km round trip journey 2/3 highway, about 30 min mountain driving rest was city and b roads. In the morning the MAF was not behaving good and it had disconnected the s/c so I was running n/a without s/c. After around 150 km after I had left home and on the highway at around 2300 - 2500 rpm the oil light lit and it wouldn't turn off. I continued for around 10 min until I had finished the highway journey and one I entered b roads (40 - 50 kph) the oil light went off. Once I entered the next city I bought 2 liter of oil and added about 500 ml to the engine. Continued my 45 min journey across the city and up the mountain. The oil light remained off. Next day was returning and 10 - 15 min after I had entered the highway the oil light turned on again. I continued the journey and the light would go on and off. Drove for around 40 km until I finished the first highway stint and added the other 500ml from the first can. Kept driving and after around 1 hour of b road and short highway stints, the light kept going on and off. At the end of the journey, I stopped for lunch for about 1/5 hrs. When I checked the oil level it was below min. I added the second liter of oil and returned home.
After that journey I have done only about 100 - 150 km of city driving so haven't checked the oil level yet.
I talked to my mechanic and he told me most probably it is the valve seals. I read a bit about the valve seals and people are saying that the most obvious thing when valve seals go bad is a plume of smoke on start up after a long rest. I haven't seen any smoke on start up or while running.
Any idea what to look for?
Thanks
Deni