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2000 Seville STS overfilled oil


Jbird06410

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Brought my 2000 Seville STS to get my tire fixed as it had a slow leak...Guy tells me the oil is low...He added recommended an oil change but I told him to just add some oil as I did not need a change for a few thousand miles. Mu husband is a regelious oil changer. We usually have to add a quart or two on occasion. OK That was Thursday. I did not think anything of it until today when I noticed that there was oil leaking out of the bottom of the engine. My husband looked at the dip stick and it is overfilled. Looks like maybe 2 quarts. Not sure. The line is way past the fill mark.

anyway....what kind of damage has been done? I drove roughly 100 miles. Any advise on what to do? (besides doing a little yelling and screaming. ) I replaced the head gaskets over a year ago. I do not want to go throught anything like that again.

We do not want to touch the car because they will say we caused the damage. Not sure what to do now.

Here's to thinking I was doing a good thing by getting the tire fixed without my husband. Thought I was being helpful....lesson learned.

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Where was the oil coming from? I think when overflowed it can flow through the PCV valve, so you might suggest your husband replace that also. It is a maintenance item, and not expensive.

Bruce

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  • 2 weeks later...

Can the overfilled oil cause a P0300 error to occur? On Monday the car started to run rough out of the blue and we have a P0300 error. That is the only error.

After reading the forums we will be checking the items mentioned here. I have a list...Just curious to know if the overfill could cause it.

Last Friday we also had to replace the battery. The month before we put over $1000 on some front end work. I also just put in new brakes and rotors all around. Top it off with the head gasket repair in the first two months of owning it and brand spaking new tires at $600. I am going to have a ten year old brand new car very soon. I have not owned the car two years yet.

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Overfilling the oil will not cause it to have a P0300 misfire.

Check the plugs, coils, compression, etc for that.

Who did the head gasket repair?, was the block timeserted when the head gasket job was done?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The place I bought the car did it for us. They did the TimeSerts. We had asked that was done based on the folks on this forum.

Husband sez "If the overflow froze the ERG value in open condition couldn't the oil foul the plugs and ruin the CAT?"

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If the EGR pindle was frozen, you would get a pindle position code.

It may be sucked into the PCV valve however and cause smoking. Not sure if it could foul the plugs enough to cause a misfire

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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