1987 Mercedes 300SDL Oil Change
#1
05-29-2012, 01:28 PM
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1987 Mercedes 300SDL Oil Change
Just bought a 1987 Mercedes 300SDL with 200K Miles. The oil was very black so I changed it yesterday. Now I discover that Diesels require "C" designation oils and I filled it with SN for gas engines that I had for my other cars. Can I run that around town a while or should I take it out right away? Many thanks.
#2
05-29-2012, 01:58 PM
C stands for commerical. What is the second letter? What is the viscosity grade of the oil?
European cars go with the ACEA standard than with the API. Get an oil with the ACEA B3 standard- this is a high temperature, turbocharger safe oil.
The oil might be ok for a couple of miles, but get rid of it soon.
European cars go with the ACEA standard than with the API. Get an oil with the ACEA B3 standard- this is a high temperature, turbocharger safe oil.
The oil might be ok for a couple of miles, but get rid of it soon.
#3
06-01-2012, 05:55 PM
#4
06-04-2012, 09:16 AM
USA API oil ratings (click here for details):
Sx = spark igntion (gas engines)'S' stands for Service
Cx = compression ignition (diesel engines)'C' stands for Commercial, you will find the terminology at the API Institute.
European oils have different rating classifications.
Sx rated oils are not designed to suspend soot and should not be used, although for a short duration (few hundred miles) it won't hurt anything. Change it to a proper CI/CJ rated diesel oil soon.
As noted above, the oil will always look black. That's because it's suspending the soot. It will turn black within a couple hundred miles after changing it. You should change the oil based on mileage, not color. With standard diesel oil, 3-5kmi is usually fine. With good synthetics (Group IV/V only) you can extend that to 10k-15k but ONLY if the oil analysis shows the soot level and TBN remaining at acceptable levels. Your OM603 is a relatively low-soot engine (compared to the OM617) especially if EGR is disabled. I run mine to 10k between changes with Amsoil or Red Line 15W-50 or 5W-40. (I had to stop using Mobil-1 as they cheaped out on their newer oils and went to a Group III base stock that starts to break down before 10k... not cool.)
Sx = spark igntion (gas engines)'S' stands for Service
Cx = compression ignition (diesel engines)'C' stands for Commercial, you will find the terminology at the API Institute.
European oils have different rating classifications.
Sx rated oils are not designed to suspend soot and should not be used, although for a short duration (few hundred miles) it won't hurt anything. Change it to a proper CI/CJ rated diesel oil soon.
As noted above, the oil will always look black. That's because it's suspending the soot. It will turn black within a couple hundred miles after changing it. You should change the oil based on mileage, not color. With standard diesel oil, 3-5kmi is usually fine. With good synthetics (Group IV/V only) you can extend that to 10k-15k but ONLY if the oil analysis shows the soot level and TBN remaining at acceptable levels. Your OM603 is a relatively low-soot engine (compared to the OM617) especially if EGR is disabled. I run mine to 10k between changes with Amsoil or Red Line 15W-50 or 5W-40. (I had to stop using Mobil-1 as they cheaped out on their newer oils and went to a Group III base stock that starts to break down before 10k... not cool.)
Last edited by Deezel Stink3r; 06-05-2012 at 01:35 AM.
#5
06-11-2012, 10:40 AM
"Service" and "Commercial" are meaningless terms. The POINT is, Stinker, that Sx is for gasoline engines and Cx is for diesel engines. You can have a gasoline commercial engine, but uh-oh, which category do you use?
Direct quote from API.org motor oil guide:
Direct quote from API.org motor oil guide:
Gasoline engine oil categories (for cars, vans, and light trucks with gasoline engines): Oils designed for gasoline engine service fall under API’s “S” (Service) categories.
Diesel motor oil categories (for heavy-duty trucks and vehicles with diesel engines): Oils designed for diesel-engine service fall under API’s “C” (Commercial) categories.
Your un-credited edit to my previous post is technically correct, but it does not help clarify anything.Diesel motor oil categories (for heavy-duty trucks and vehicles with diesel engines): Oils designed for diesel-engine service fall under API’s “C” (Commercial) categories.
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