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Old 08-26-2002, 03:31 PM
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Oil Change Question

My car has been sitting for the last 3 months, since my last oil change, and I have maybe driven it 100 miles at most. I am wondering if it would be a good idea to change the oil when I get it back from the shop this week. Also if an oil change is needed, would a filter change be needed.

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Old 08-26-2002, 03:48 PM
lrg lrg is offline
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I believe that regular oil (non synthetic) should be changed every 6 months or 3,000 miles, which ever comes first. While you can debate the exact intervals, the time limit is based upon the tendancy of oil to build up acids that can damage internal bearings. For a car that has fresh oil and is never driven I'd expect you could go longer than 6 months. If, as you have, you run it once in a while (which it should be to keep your seals pliable) the acids will potentially build up and you don't want to leave it in there too long. As to the filter, I'd guess the old filter is still fine but be sure you drain all the oil out of it (pretty much automatic on most Mercedes). One important detail, if you only run the car a little, be sure you get the engine (and more importantly the oil) up to full operating temperature so any condensation in the crankcase has a chance to boil off. Water in the oil, even if only a little, can do as much or more damage than tired oil.
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Old 08-26-2002, 04:47 PM
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no way

The manual says something about "light duty"- the maximum time (as measured in days or months) between oil changes if you have driven less than 3k or 5k.

I think it is yearly, but at any rate it is way longer than 3months.

I wouldn't change the filter in that case.

someone else may post with the exact answer...
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Old 08-26-2002, 05:22 PM
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Six months would be a good maximum. It also depends on the intervals of that 100 miles. If it was a half mile at a time, you should change it now. What causes the excess acid build up is lack of thorough warm ups that will boil out the moisture and some of the other contaminants. A thorough warm up is typically about 17 miles.

Good luck,
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Old 08-27-2002, 12:10 AM
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Thanks for the responses. I think I will wait and change it again at 3,000 miles, or sooner depending on how much I drive it in the next 3 months.

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