Can i top-off oil with a mix of 5w-40 and 10w-40? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 09-01-2010, 12:26 PM Thread Starter
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Can i top-off oil with a mix of 5w-40 and 10w-40?

I have a 1984 Mercedes Benz 300D with about 222K miles on it. I was in a bind and needed to top it off but I only had 5w-40 in the car and it needed a second jug. So I went to the nearest gas station but they only had 10W-40. So I bought that one and poured in both. Is this ok? Or should I have the oil changed asap?

Thanks in advance!
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post #2 of 7 (permalink) Old 09-01-2010, 01:14 PM
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As long as both oils have the same C-classification, or at least close -no problem in mixing different weights.
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post #3 of 7 (permalink) Old 09-01-2010, 11:39 PM
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I'd say you're better off with the 10W40 anyway. The less difference between the cold and warm viscosity rating, the more good base oil there is (because there's less viscosity improving additives). But, you didn't put a location, so maybe you're in the cold and you need the 5W.

As for mixing oils--and maybe I'll get hit by a can of spam if I say this--you can mix anything, as long as it's appropriate for your engine. But, some people like to stay with the same brand as much as possible.

Even if there was harm in mixing brands, doing that for one Oil Change Interval ain't gonna hurt nuthun, especially for s mid-interval top off.

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post #4 of 7 (permalink) Old 09-02-2010, 09:29 AM
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Not quite everything.
Diesels run with different chemical byproducts and oils have antidotes for them. You put gasoline antidotes into diesel engine and you make chemical mess.
Again, per my experience the difference are to small to ever notice, but it is like mixing wine, beer and vodka.
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post #5 of 7 (permalink) Old 09-02-2010, 09:41 AM
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I don't like to but have also been forced to mix 2 different oils. In my case I added a couple of quarts (not at the same time because I was using oil) of 0W40 to the 5W40 that was in there. Both were Mobil1 full synthetic with the proper MB specification. I ran at least 2000 miles that way until the next oil change. I wouldn't worry about it.

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post #6 of 7 (permalink) Old 09-02-2010, 12:20 PM
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Quote:
Originally Posted by Kajtek1 View Post
Not quite everything.
Diesels run with different chemical byproducts and oils have antidotes for them. You put gasoline antidotes into diesel engine and you make chemical mess.
Again, per my experience the difference are to small to ever notice, but it is like mixing wine, beer and vodka.
Yes, that's what I said.

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Originally Posted by jsap View Post
As for mixing oils--and maybe I'll get hit by a can of spam if I say this--you can mix anything, as long as it's appropriate for your engine.

Beware of stealers
(and shill posters who work for stealers)
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post #7 of 7 (permalink) Old 09-02-2010, 02:07 PM
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Originally Posted by 1984bluejay View Post
I have a 1984 Mercedes Benz 300D with about 222K miles on it. I was in a bind and needed to top it off but I only had 5w-40 in the car and it needed a second jug. So I went to the nearest gas station but they only had 10W-40. So I bought that one and poured in both. Is this ok? Or should I have the oil changed asap?

Thanks in advance!
Check the container, but I haven't found a 10w-40 oil yet that is diesel compliant.
Is the 5w-40 synthetic?
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