[Herojoker]

I have just bought a 2017 bmw 330i from the dealership. They declared nothing wrong with the car before I got the keys and 3 days later the engine oil is very high and I have to baby the car home. Once I popped the hood white smoke was coming out of the engine oil cap. The sensor on my dash said it was at a reasonable temperature but the screen said it was over heating. Any ideas?

[Herojoker]

Just looked at my coolant and it’s all gone with no leaks

[thejeremyman9]

Are you confusing oil temp on the gauges with coolant temp warning? Sounds like you need to take it back to the dealer...

[Herojoker]

Originally Posted by thejeremyman9

Are you confusing oil temp on the gauges with coolant temp warning? Sounds like you need to take it back to the dealer...

No the oil temp is fine but the computer is telling me the engine is overheating with seems odd. I might get it towed over to the dealership anyways however

[Wgosma]

Did the engines Oil Temperature exceed 'normal' temp range?

White smoke = steam (water > boiling temperature).

A breached head gasket can cause coolant to be mixed with oil….seeing steam coming out of the place where oil is added is potentially a bad sign.

Get that car to Mr Dealer….on a flatbed truck.

[Billfitz]

I hope Texas has a lemon law.

[thejeremyman9]

Originally Posted by Herojoker

No the oil temp is fine but the computer is telling me the engine is overheating with seems odd. I might get it towed over to the dealership anyways however

The oil temp can be fine while the coolant overheats. They are related obviously but not 1:1. Same way your coolant gets up to temp much faster than oil warms up. So its entirely possible to have normal oil temp while the coolant overheats.

[Wgosma]

Originally Posted by Billfitz

I hope Texas has a lemon law.

Does lemon law apply to used vehicle?

[eluded]

Originally Posted by Wgosma

Does lemon law apply to used vehicle?

Might vary by state but if it's still under the original warranty yes.

PCV valve?

[Fliplegend]

Originally Posted by Herojoker

Just looked at my coolant and it’s all gone with no leaks

Get your headgasket tested.

[Wgosma]

Originally Posted by Fliplegend

Get your headgasket tested.

OP: very inexpensive and simple/quick to borrow head gasket tester from auto parts store and DIY- however if car came with any sort of warranty you should see Dealer first. If car was sold as-is, no implied warranty still worth Dealer visit/discussion- the worst they say is ' not our responsibility'.

[Fliplegend]

Originally Posted by Wgosma

OP: very inexpensive and simple/quick to borrow head gasket tester from auto parts store and DIY- however if car came with any sort of warranty you should see Dealer first. If car was sold as-is, no implied warranty still worth Dealer visit/discussion- the worst they say is ' not our responsibility'.

I agree go to the dealer either way. Personally, I would still test it so you know and knowing will help you from getting taken advantage of by the dealer.