Blacksmoke A Symbol of Hope for a More Just and Transparent Society

So recently I had been having issues with warm starts. Cold starts were fine, only slight bogging until it eventually leveled out. I would check EGR valve for dirt build up and proper working , clean the MAF (make sure they use the correct cleaning agent and not just brake ... Use only full synthetic oil and the correct type and grade. 2008 SX CRDi Auto White (Lila)[hr]2010 SLX CRDi Auto Red (Ruby) ... ... black exhaust smoke is too much unburnt fuel in the combustion chamber. This is usually due to a problem with the air-fuel mixture. Here are ... Only thing I can think - I added a 1/2 litre of lucas heavy duty oil additive to the top of the engine (because access is easy) last night - ... This means there is not enough air to burn all of the fuel being injected, and the "left over" fuel is only partially combusted producing black ... White smoke on startup might be condensation in the exhaust system burning off. I don't think replacing serpentine idlers could have caused any problems. I noticed since I got the tractor that it intermittently puffs black smoke at idle or full throttle. Just a short puff but seems to happen ... This used to only happen at 5,000 rpms but now it is happening around 4,000 as well. Have to let off and come back into it. When this ... Clogged fuel filter should make less black some shouldn't it ? Filter only has 2000 miles on it. 05 Chevy 2500hd 6.6 duramax Allison ...