Oil change frequency - Mercedes-Benz Forum

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post #1 of 18 (permalink) Old 11-22-2014, 05:52 PM Thread Starter
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Oil change frequency

How often should one change the oil in a 1973 280SE? Any suggestions of best oil to use in northern California?
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post #2 of 18 (permalink) Old 11-22-2014, 08:18 PM
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I would recommend every 3000 miles or once a year.
I use Castrol GTX 20W50
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post #3 of 18 (permalink) Old 11-23-2014, 07:43 PM
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in cold weather use shell rotella T 15 / 40 , 3000 is fine .
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post #4 of 18 (permalink) Old 11-25-2014, 03:37 PM
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Agreed on 3k miles, but if you get "fuel wash" and your oil smells like gasoline at all then do oil changes every 1,000-1,500 miles to help keep things in order, some MFI cars have this issue.

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post #5 of 18 (permalink) Old 11-26-2014, 07:56 PM
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I would stay away from oils like Castrol gtx. go with a good synthetic
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post #6 of 18 (permalink) Old 11-26-2014, 08:56 PM
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castrol GTX is considered a premium oil , why saying to stay away . also i would not recommend using a synt oil in a old engine that has use conventional oil until now .
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post #7 of 18 (permalink) Old 11-27-2014, 11:05 AM
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Depends on how much you drive the car. My 240D gets under 1000 miles a year on it, sometimes much less. So I go with a change every two years. But I also have done an oil analysis to check the quality of the oil, so I know that after that length of time, the oil is still good. So unless you do an oil analysis, you are just guessing and are probably costing yourself more money than you need to without any commensurate benefit.

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post #8 of 18 (permalink) Old 11-27-2014, 11:31 AM
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Quote:
Originally Posted by agillot View Post
castrol GTX is considered a premium oil , why saying to stay away . also i would not recommend using a synt oil in a old engine that has use conventional oil until now .

+1 on this one.

From all the research that I have completed, Synthetic oil is not recommened for these older engines.
When I replaced my camshaft, it was recommened to me to use Castrol GTX, from Mike at Metric Motors.

Metric Motors has been rebuilding Mercedes engines since 1979. I have been using castrol for the last two
years with no complaints. I do change the oil at the 3000 mile mark or once a year which every comes first.

On a side note, I have used Castrol GTX on a 1995 2.4L toyota pickup engine since the day I bought it in new
in 1995. The engine has never had any engine issues ever, and it still fires up on the first crank to this day.
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post #9 of 18 (permalink) Old 11-27-2014, 06:48 PM
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I am surprised. first of all I will admit that I am not an oil specialist, however. having had my motor rebuilt about 5 years ago by a very reputable shop (they mostly do hemi engines that pump out 6-700 hp) I was advised to stay away from conventional oils such as castrol gtx. something to do with ash and buildup. once again, I am not an expert, but I did do 600 000 kms on a Saturn sl2 and I only used synthetic. wondering if I would have reached that number with an regular oil
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post #10 of 18 (permalink) Old 11-27-2014, 07:10 PM
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just as additional info. last year I went in for an oil change on my mazda 3. it was January and it is very cold here in montreal. I always use synth but I was short on cash that day, so I got the cheaper oil change. im not joking but for the time I had the regular oil in my car it would tick for a few mins in morning at first start and same thing in the evening. not sure if it was the lifters. when I did my next oil change and put synth oil. the ticking just stopped. makes me think that the regular oil thickens up during cold weather, so I guess that would add added stress to the motor. but then again im not a mechanic, its just my assumption
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