[mark.moran87]

Hi,

My Mazda 6 2.3i has started to burn oil (i am assuming its burning it as there is no leak). I am using approx. 2 litres every month (1000 miles).

I have also noticed that when the engine is idling it feels like its going to stall and the car shakes.

I had a look at the spark plugs the other day and found that they have a lot of black soot on them (See attached images).

Anyone got any ideas what might be causing this?

Could it be the PCV valve?

Thanks

 

[Polish_Eagle]

If I'm not mistaken, black soot usually means you were running rich (too much fuel) or the plugs are REALLY old (can't remember for sure though). How many miles/km on the spark plugs?

Is the soot wet or dry? Here's a plug guide: http://www.freeautomechanic.com/plug burn chart full.html

 

[Shortzy]

my 6i started burning oil at about 100k. I was a little lax on monitoring it and ended up spinning a rod bearing at 104k. Never found out what the original problem was, replaced it with a brand new bottom end...