It will put out blue smoke when i first start it until the engine warms up
Need to change valves steam seal.
There is a leak of engine oil during cool down of the engine. So when you start the cold engine it is burning oil that leak inside the combustion chamber.
Hope it helps.
SOURCE: 2003 gmc 6.6 turbo diesel sometimes smoke a lot
If the smoke is white smoke and you have it after it has run for a while or when you stop at a stop sign or light it is one of two things or possibly both. I have a 2003 GMC 3500 that had the same proble. It turned out to be a combination of Injector being bad and Glowplugs. Injectors are covered up to 200,000 miles but not the glowplugs. I bought 4 glowplugs of the internet for 10.49 a piece AC Delco New. The dealer replaced all 8 injectors and 8 glowplugs. I paind for 4 GP's and the installation 213.00. Truck has more power and NO white smoke you might need to take it to the dealer. The test for the injectors is about 85.00 but well worth the expense
SOURCE: how to stop a 1995 gmc from smoking blue smoke
Try adding some engine restorer to the oil and see what that does.Thanks for asking and I hope it helps.
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