Mobil 1 0w40 Acrid odor at change

[dickwells]

Just changed the 0W40 out of my 02 Silverado with probably 2-3k on it since last fall. I noticed an acrid odor which I remembered from changing out the oil in a large tank which was used to soak phenolic tubes at a temp of about 350F. I had added one qt of Mobil 1 5W30 within the last couple of months. Just wondering if anyone else has smelled this. The motor has definitely not been overheated at all. TNX, RW

 

[BobFout]

How does the smell compare to fresh Mobil 1 0w40 or fresh Mobil 1 5w30. Most oil smells unpleasant. (Yes, I'm an oil sniffer)

 

[dickwells]

Yea, it smells much stronger than new oil. Either like it is starting to break down or I got some kind of interaction between the 0w40 and the other oil I mixed with it.

 

[BobFout]

I'm going to guess some kind of interaction.

What oil did you put in after the change?

 

[dickwells]

I refilled with the same thing, Mobil 1 0W40 and Pure 1 filter.

 

[BobFout]

Originally Posted By: dickwells
I refilled with the same thing, Mobil 1 0W40 and Pure 1 filter.


OK, I guess maybe sniff the oil after another 2K or 3K miles and see how it smells, assuming no other oils will be added.

 

[mechtech2]

Probably contaminants in the oil. Water and acids - maybe cooties that grow in there.
From oil mixing? Unlikely.

 

[gathermewool]

Probably not breaking down after so few miles, and I doubt it's an interaction.

 

[Steve S]

GRIII basestocks!!!