Question about BMW 525

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Blue smoke until warm comeing from exhaust - 525 BMW Cars & Trucks

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That isn't good

Is it a diesel?

Posted on Dec 02, 2012

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My steed smokes on a warm up. Is this normal?

Depends on the colour of the 'smoke'?

White is steam, can be condensation in the exhaust, or a bad cylinder head gasket.

Black is rich mixture.

Blue is oil. Can be worn out oil, oil that is too thin worn bore, worn piston rings or a broken scraper ring. Try something like STP Oil Treatment.

One further thing is that tolerances within the engine are larger until the engine warms up, then the gaps reduce when the engine is hot.

May 26, 2017 | Cars & Trucks

1 Answer

There's blue smoke coming out of my exhaust on my 2003 ford explore

Here's a link on why your vehicle has blue smoking coming out of the exhaust. Blue Smoke From Exhaust

Nov 25, 2015 | Ford Cars & Trucks

1 Answer

Td5 starts well no smoke let it warm up and gradually gets to smoke screen status

Its burning oil. The issue might be the rings overheated or some dirt got in the cylinder when it was apart

Mar 29, 2013 | Cars & Trucks

2 Answers

Hi I have Ford Focus 2.0 trend 2000 modle and it smokes heaverly on start up but once it is warm no smoke at all. I have recond the head complete and sent it back for a check, they there is nothing wrong...

I would need to know what color this smoke is because of it is white then I would say that you are probably witnessing normal operation. Modern Cat. Converters are designed to reduce emissions to carbon dioxide and water. This water condenses in the exhaust as it cools while shut off and produces white smoke when restarted until the exhaust is warm enough to evaporate the moisture. If the smoke is blue then you are getting oil leaking into the cylinder and it is probably coming from the valve seals but without a visual inspection that is impossible to be sure.

Mar 25, 2011 | 2000 Ford Focus

2 Answers

Blue smokes come out tailpipe when i start the car but stops afte

Helllo there
Symptom: Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it. Possible causes:

  1. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  2. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)
  3. Damaged or worn valve guides.
    The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:

  1. The PCV system is not working properly.
    The Fix: Replace PCV valve.
  2. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  3. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  4. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)

Jun 01, 2010 | 1989 Buick Electra

1 Answer

1992 gmc sierra turbo diesel starts and idles fine until warm up

It's time for a Italian tune up!

The blue smoke can be one of two thing.

oil drop from the valve stem (from engine head to cyclinders)
diesel soot collect inside the exhaust system.

I will take a 5-10 minutes high rpm (not redline) ran on the highway.
Pay close attention to the rear view mirror and look for black diesel soot.
=== I will use Diesel Cleen or similar product to condition the fuel. (keep moisture down)
Use the recommended amount of SEAFOAM oil additive to condition the valve stem seal/rubber parts.

I can not rule out excessive blown by.
Can you get a diesel compression tester?
When was the last valve adjustment?

Please post the actual odometer on the engine and I will follow up on it.

Apr 21, 2009 | 1992 GMC Sierra K1500

1 Answer


If the smoke is blue and goes away after it warms up and the engine runs fine. It's most likely your valve guild are worn, they are common to let oil run in to the piston chambers when the engine has been parked for a few hours and most notice when parked over night. Nothing to loose sleep over, good luck

Apr 08, 2009 | 1993 Chevrolet Suburban

5 Answers

Blue smoke coming from exhaust

blue smoke out of 1.8 turbo its allways bad oil seal inside turbo.need new turbo or rebuild OEM. with 24 years experience working with vw never seen single headhasket go bad on 1.8 turbo smoke its 100% turbo every time

Jul 17, 2008 | 1999 Volkswagen Passat

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