oil usage

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#11

03-18-2012, 08:04 AM

shipo

Senior Member

Join Date: Nov 2008

Location: southern New Hampshire

Posts: 2,726

Quote:

Originally Posted by hxturbo

No leak, no smoke and vehicle just passed smog. Buddy thought that maybe catylitic was burning smoke/oil before it reached tail pipe. Very strange and I am stumped. I am going to go to dealer and ask question. Thanks guys.

I don't believe it is even remotely possible for a catalytic converter to burn off that much oil; if you don't smell burnt oil when the car is running, then I leaking is pretty much your only other option.

#12

03-18-2012, 09:17 AM

MazdaTirol

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Join Date: Feb 2012

Location: Tirol, Austria

Posts: 756

Quote:

Originally Posted by shipo

After thinking about it I am now not so sure it can also, the amount of heat needed to burn off that much oil would melt the cat to bits if it didn't plug it up first to where it wouldn't work.

#13

03-19-2012, 08:08 AM

Kevinkpk

Senior Member

Join Date: Mar 2012

Location: Tulsa

Posts: 444

Quote:

Originally Posted by MazdaTirol

It is possible the cat is burning the oil but you would have blue smoke at startup when the cat is cold still, do they give you a readout of the HC PPM when you get the car smogged (tailpipe sniffer) or is it just the OBD II hookup?

Disregard text above SEE POST #12

The cat is there to super heat the exhuast as to burn any unburned hydrocarbons there might be. I'd suggest pull a couple plugs to check for any fouling, you need to isolate this to burning oil, or a leak.