My 2002 Trailblazer LTZ is getting coolant in the oil. What causes this?


Asked by Mar 11, 2013 at 11:55 AM about the 2002 Chevrolet TrailBlazer LTZ 4WD

Question type: Maintenance & Repair

14 Answers

Head gasket blown, less likely cracked head or block

3 people found this helpful.

Just changed the oil yesterday never started it up and looked this morning and it was milky. I started it and sounded bad for a minute and then drove fine.

1 people found this helpful.

I just drove it to the shop a mile from the house, is it a costly fix?

2 people found this helpful.

Unfortunately, yes. Expensive. It will dirve OK until it overheats, but do not drive it anywhere else, to prevent further damage from improper lubrication in the rest of the engine. Sorry to bear bad news. $1500 minimum

2 people found this helpful.

Wait, hold changed the oil but never started it? Did you put the oil in the right place????


Yes. Lol . It ran hot one day so we checked the antifreeze and notices it was empty! So we added antifreeze and checked it the next day and it was empty again. Never drove it again after it ran hot. Checked the oil and that where we found our antifreeze. So we changed the oil and it went there again. Today is the first day I drove it since it got hot and we noticed the problem last week.

I didn't mean to insult you Stephanie. But it has been known to happen. So back to my first answer.

1 people found this helpful.

No insult taken. I've been known to do some silly things. I let a man do anything under a hood bc I could prolly do something like that.

1 people found this helpful.

Could it be a cracked Cylinder?


Sounds like a blown head gasket or intake gasket. Since you have water in the oil, it is not safe to drive. You will cause further engine damage by driving it. Very unlikely it is a cracked head or block causing the issue. It is an expensive job to pay to have done, and quite difficult to do on your own as certain specs (torque yields, etc) are needed as well as several specialty tools.

3 people found this helpful.

Today I drove it a mile to shop. Just kinda curious as to what it could be. Truck still drives fine though.

1 people found this helpful.

Sorry, the battery in my wireless mouse went dead and had to search around for a battery. Anyway, Michael is right, a cracked cylinder is remotely possible, and cracked head and/or block also, unless you drove it overheated for a long period, which it seems you did not. As I said, that coolant in the crankcase will render the oil almost useless. Sure, it will drive fine, but not for long.

3 people found this helpful.

Be prepared to spend some money. again, sorry to be the bearer of that

1 people found this helpful.

I guess I will no the fate of this tomorrow.

1 people found this helpful.

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