{"id":746,"date":"2021-10-06T18:42:22","date_gmt":"2021-10-06T18:42:22","guid":{"rendered":"http:\/\/localhost:10008\/?p=746"},"modified":"2024-03-15T15:22:51","modified_gmt":"2024-03-15T15:22:51","slug":"the-causes-of-blue-smoke-from-a-diesel-and-what-to-look-for","status":"publish","type":"post","link":"https:\/\/learndiesels.com\/the-causes-of-blue-smoke-from-a-diesel-and-what-to-look-for\/","title":{"rendered":"The Causes of Diesel Blue Smoke And What To Do Next"},"content":{"rendered":"\n

So, you have some blue smoke billowing out of your exhaust. Well, you think it\u2019s blue. Does it look like a blue haze? ???? What is the cause? Maybe you are like me and have to look it up every time. No shame here. This is the complete guide to blue smoke from a diesel.<\/p>\n\n\n\n

What causes blue smoke?<\/em><\/p>\n\n\n\n

Blue smoke is excess lubricating oil present within the engine cylinders during combustion. This oil burns and exits through the exhaust as blue smoke. Common causes include too much oil in the crankcase, worn piston rings, or a blown turbo.<\/strong><\/p>\n\n\n\n

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Your burning oil. That part is simple. Understanding all the different reasons you can have oil in the cylinders is not. Here are the things it could be and what to look for\u2026<\/p>\n\n\n\n

1. Is it really blue<\/h2>\n\n\n\n

Spotting blue smoke can be difficult if you don\u2019t know what to look for. The \u201cblue\u201d color is often faint. You should be able to see a blue haze to an overall \u201cgrey\u201d kind of smoke. You can often smell ???? the difference. Oil smoke has a distinct smell, like an asphalt parking lot or roofing tar on a hot day. If it is blue, I should say that blue smoke should not be happening at any time.<\/em><\/strong> It is evidence of a problem and should be investigated.<\/p>\n\n\n\n

I have seen some dismiss it as normal. No amount of blue smoke is normal.<\/strong> A new engine may burn oil without any evidence of blue smoke because of the good compression it can burn oil cleanly. However, it is not acceptable for any engine to burn large amounts of lubricating oil.<\/p>\n\n\n\n

A great thing to do as a preventive for your diesel engine is an oil and fuel additive. Check out\u00a0This stuff (link to amazon)<\/a>\u00a0it is the best in my opinion.<\/p>\n\n\n\n

Let\u2019s take a closer look at what blue smoke could really mean and where to start the hunt for the issue.<\/p>\n\n\n\n

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Blue Smoke is caused by engine burning lubricating oil but, that oil can enter the combustion chamber from several sources<\/h3>\n\n\n\n