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Old 04-08-2002, 09:54 AM
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Join Date: Jan 2002
Posts: 18,350
oil change--does the oil cooler drain?

Just did the first oil change on my 77 300d. I am curious, does the oil cooler drain when the oil is changed? I had read somewhere that there was a thermostat in the oil cooler lines. Wouldn't this stop that oil from draining? If so, wouldn't it be advantageous to make sure that the oil did drain out of the cooler? If it doesn't drain normally, does anyone know what to do to cause it to drain?

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Old 04-08-2002, 10:00 AM
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Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
kerry edwards,

Used to be that the oil coolers had drain plugs on them and you would pull the plug to make sure the oil in the cooler came out. I think that was given up with the W123 body cars (like yours) because only a cup or so of oil came out and it was usually cool, so it took forever to drain out.

So, I think the MB engineers changed the design to save time and money. By the record of the W116, W123 and W126 cars with the same engines, leaving the little oil in the cooler in there had no net negative effect on the engine life.

Hope this helps, Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 04-08-2002, 01:11 PM
NIC
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Kerry,

As Jim said, some oil remains in cooler unless it is drained by removing oil cooler lines. Some debate on the value of doing this given the small amount of oil involved and possible issues associated with oil cooler lines. But some very qualified people on this site argue hard that the cooler should be drained.

Search and you'll find those threads.

I don't do it.

Nic
'85 300CD

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