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  #1  
Old 12-08-2009, 05:31 PM
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Replacing oil without changing filter...

Some idiot put 15-40 in my 300d the other day. Ok it was me. I'm about to switch it out with some 5-30 before the temperature drops.
What I'm wondering is, Since I just replaced the filter, (4 days ago),
Is it cool to just drain and refill without changing the filter?

I don't see why not, but I thought I would ask anyhow...

Tx

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  #2  
Old 12-08-2009, 05:33 PM
pelon's Avatar
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yeah,,,,

that's what i would do...
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  #3  
Old 12-08-2009, 05:37 PM
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Good-o.

Good luck on getting Detroit to make that electric car... we're all counting on you.
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OBK #32
1985 300D Turbo (15 gal Greasecar kit installed)
(258,900+mi.) Thanks- Tachometer Fixed. Middle Vents Fixed. Transmission- 1000% better shifting.
Vac leaks- Fixed, Brakes replaced, Steering Box replaced, .... Information Rules.
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  #4  
Old 12-08-2009, 06:18 PM
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isnt 5-30 a little on the low side for a diesel? would something in the 5w-40 range be more appropriate? just asking here, my gasser runs diesel oil all the time (15w-40 summer 5w-40 winter)
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  #5  
Old 12-08-2009, 06:40 PM
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Yeah, it's gotta be 40 weight. 5 or 0W 40 in the winter is good.
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  #6  
Old 12-09-2009, 02:43 AM
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remove cover and filter

To vent it so that drains too. Then reinstall "old" filter.
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  #7  
Old 12-09-2009, 04:10 AM
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You don't say where you are or how cold it gets.
I run 15-40 year round but it doesn't often get below freezing. If it seems too cold, I'll use the heater or drive a gasser.
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  #8  
Old 12-09-2009, 07:56 AM
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5w30 is not diesel rated oil. You need at least a diesel approved 5w40 synthetic. It makes a huge difference in cold weather starting vs. 15w40.
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  #9  
Old 12-09-2009, 01:08 PM
F18 F18 is offline
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I agree with PawoSD.......I do not believe there are any 5W30 weight oils that are API Diesel rated. They are all 40 weight oils in the US. So look for a 5W40 that has a API rating of CI, CF or CJ4 for winter use. All the ratings beginning with a "C" are for Diesel.

You should be fine reusing the filter you installed just days ago.

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87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K

Last edited by F18; 12-09-2009 at 03:05 PM.
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