Cadillac STS Forum - 2005 through 2012 Discussion, Question RE: low oil and engine light codes in Past Cadillac Vehicle Discussion; So my 05 STS started bucking and making a grinding type noise over the weekend. Yesterday while driving, it started ...
So my 05 STS started bucking and making a grinding type noise over the weekend. Yesterday while driving, it started bucking very badly and the engine light came on and started flashing. Luckily I was right at work. Called the dealer and had it towed in. Today they state first that the car had no oil, (had the oil changed 1 month ago and see no signs of leaks) then they called back and stated it had 2 quarts. The said they filled the car with oil and it is running great. They also state that the engine codes were P0303, P0304, P0305. These all look like misfire codes to me. Does this make sense to anyone? Can very low oil cause these codes? Also just an FYI the oil light never came on and they see no issue with this. Also they have no idea how I lost 4 quarts of oil in 1 month. Any ideas from people would be grealy appreciated.
I think you are right, the STS only had an idiot light for low pressure, but not for low oil level. I check my oil level everytime I fill up just to be sure. Some have claimed they burn a few quarts in 1000 miles. I can't remember what GM claims is normal, 1qt every 2K miles? A couple people have had the piston rings replaced and said that stopped all oil burning and the car ran great. Of course, I think most of those were under warranty, as that would be a pricey bill to have to foot.
With this car, I've gotten into the habit of checking my oil regularly... about once every two weeks or before and after long trips, relatively speaking.
Interestingly, if I check it cold, it shows the oil right at the top (maybe a millimeter above) of the "cross hatches" on dip stick. If I start it, let it run for a few minutes, shut it down and let it sit for about 3 minutes, when I check it then, the oil is right at the bottom (maybe a millimeter above) of the cross hatches. Based on this variance I see in the oil level on the dip stick, I can understand how one might always be driving around on the lower side of "full". Particularly if they only check their oil level when the engine is cold.