6 Diesel Mistakes Mechanics BEG You To Stop (#1 Is Permanent!)

6 things diesel mechanics say you should avoid doing to your car. Every diesel mechanic sees the same handful of mistakes over and over, and almost none of them come down to bad luck. Its the owner. In this video I'm counting down the 6 habits that quietly kill diesel engines, from the one that slowly shortens your engines life all the way to number one, which does permanent damage no workshop can ever reverse. We cover why revving a cold diesel does more harm than people think, what actually happens when you switch off a hot turbo straight after a motorway run, and why diesel owners can't get away with ignoring the fuel filter and water separator the way petrol drivers can. Then we get into running the tank near empty (this one surprises everyone), ignoring the DPF warning light, and the big one at number 6... putting the wrong oil in your diesel. That last one is the mistake mechanics can spot just from your service history. If your diesel has a particulate filter it doesn't just need the right thickness oil, it needs low ash oil, the low SAPS / ACEA C spec, or your makers own code like VW 507 00, BMW Longlife-04 or Mercedes 229.51. I explain in plain english why ash never burns off, why it permanently blocks your DPF, and how a single wrong oil change can write off a nearly new car. None of these fixes cost real money. Most of them take seconds. But they prevent the exact failures filling up workshop diaries right now, the common rail pump failures, the coked turbos, the blocked DPFs and the four figure repair bills that come with them. If your guilty of any of these let me know which one in the comments, the fuel light gamblers already know who they are. And subscribe if you want to catch the next one, where we're naming the actual diesel engines mechanics quietly warn their own friends never to buy. Topics covered in this video: diesel engine mistakes, common diesel problems, DPF explained, diesel particulate filter blocked, low ash oil, low SAPS oil, ACEA C3, turbo failure diesel, cold start diesel, diesel fuel filter, high pressure fuel pump failure, common rail diesel, diesel maintenance tips, how to make a diesel last longer, diesel oil specification If you find this video informative please subscribe ‪@carguides101‬ .