![]() An example of this is if you have a performance engine with forged pistons these may get a rattling noise when they are cold and get a noise called piston slap. The other reason for warm-up is to allow all of the moving parts to get up to their correct operating temperatures and expand and contract to the correct clearances. The oil moves pretty quickly but when the oil is cold it is too thick to lubricate correctly. Tony: Warming-up the vehicle is to allow oil to flow around the engine. RVD: Apart from getting oil around the engine, what’s the purpose of warming up the engine, from an expert’s point of view? 30 minutes of warm-up is not necessary and on modern diesels will cause problems with DPF-type vehicles and excessive soot build-up from EGR in the intake, etc. Don’t over-rev the vehicle, just take it steady until it warms up to normal on the temp gauge. I feel that you should start the vehicle give it a minute or two then proceed off at a steady pace. Tony: Warm-up is a little bit of a personal thing. RVD: For how long should you warm up the engine on your diesel tow rig? Thirty minutes is probably a bit excessive, right? His 30-odd years of experience should hopefully put some minds at ease. Sit back, relax, and get the real information from a mate of ours, Tony at Motovated Turbo and Mechanical in Toowoomba. We thought it time to sit down with an actual expert (who doesn’t even own an armchair!), and get the ins and outs of the warm-up and cool-down process on our modern tow vehicles. So we ask the question, is a long idle killing your diesel engine? We noticed posts about idling your diesel tow vehicle for an extended period are gracing the pages of Facebook again. ![]()
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