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#1
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oil press @ idle lowering over time
HOLA el grande diesel hombres;
Ive been noticing lately my idle oil pressure when hot after 30 minutes @ highway speeds has gone from about 1.3 bar to 1 bar. Over a period of about 3-4 months. The last months @ winter temps of course. My sled is a 83 300sd w/ 230k Pressure is 3 bar @ startup in morning and pegs @ anything over 1300 rpm and immediately upon acceleration. Last oil change was 1500 mi ago. My son did it and used (ugh!) regular exxon 10/40. Im sure my valve guide seals may be going. Slight leak from oil filter housing and from oil dipstick tube @ block. What would you suggest to get the pressure up? What oil should I put in (Im going to change it out) to go in hottest weather? Should I up the weight? Will going full syn help? I absolutely LOVE this car, at present slightly more than my son, and want the best fix. |
#2
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1 bar is still fine, as long as it goes up upon using the throttle. How long have you had the car?
I find that my oil pressure responds to temperature and humidity differently..i.e., the lowest I've seen it go was always on very humid, rainy days. Not sure why... 10w40 is fine for warm weather, but you can also try 15w-40. Going synthetic shouldn't make much difference, but with a synth 5w-40 you might actually see the oil pressure go down even more, just becasue it flows better.
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Dan 2005 E320 CDI - 246k 1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k Past: 1987 300D - 264k |
#3
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1. 10w40 regular oil should be REMOVED ASAP from the engine, that is not a diesel oil and has nothing in it to help trap soot particles and cannot stand the higher pressures in a diesel, it will increase wear on the engine
2. 1-1.5 bar after a hot highway drive is normal, as long as it pegs back up to 3 at anything above 1200-1300rpm. 3. Valve guide seals are not a common maintenance issue for this engine, most never need it, and they have nothing to do with your oil pressure. 4. More likely your problem is due to the gas engine oil you are running, it may be breaking down. CHANGE IT with diesel oil! I'd use a 5w40 synthetic DIESEL oil of your choice. Hopefully this helps. I'd get that gasser oil out of there right away though.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#4
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The SD uses an electric oil sending unit. as you said, this has happened in the last 3 - 4 months. so maybe it is becoming a little faulty.
I won`t get into the oil debate, but, any oil is better than no oil. the Diesel oils are formulated differently than the Gasser oil. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#5
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True, the sender may be ailing. But still change out that gasser oil!
If you replace the electric sender, be sure to buy a VDO unit if you buy a new one.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#6
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Oil loses the effectiveness of its velocity additives over time. Its one of the reasons oil is changed frequently instead of just leaving it in forever.
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