Automotive Journal

Modern diesel engines are a feat of engineering, combining impressive power with fuel efficiency. Their environmental friendliness and fairly low maintenance have been the cause of their long-time popularity in Europe, and they are recently beginning to become more common in the U.S. Given the slew of benefits they carry, diesel engines may quite possibly become more popular than gas engines someday. If you’re like most U.S. drivers, you’re probably not very familiar with diesel engines. Here are some tips to get you introduced.

1) Nearly all new diesel engines come equipped with a turbo-charger. Think of a turbo-charger as a jet engine - it forces outside air into the engine and increases efficiency and performance. Turbo-chargers are very powerful, so great care must be taken to make sure the air entering the turbo-charger is clean and clear of debris. Therefore, it’s important that the air filter on your diesel is clean and changed often. Most manufacturers equip their vehicles with electronic sensors that will tell you to check or replace your air filter, and when this sensor tells you to change the air filter, do so immediately. If you ignore this warning, you could damage your engine.

2) The fuel filter in a diesel engine is very important, since diesel fuel isn’t as clean and pure as gasoline. Your car has sensors which will tell you if your fuel filter is clogged, and you should take action quickly after this sensor goes off. Neglecting a clogged fuel filter can result in you being stranded on the road. Fuel filters need to be changed more often than gas fuel filters, so you should expect to replace your fuel filter earlier than normal.

3) You may be surprised to learn that diesel fuel contains water! A little bit of water won’t damage your engine, but the vast majority of modern diesels are fitted with water/fuel separators regardless. Some vehicles may require you to manually remove the water from the diesel’s fuel system. Your owner’s manual will tell you how to do this, and how often to do it. If DIY is not your thing, many service facilities are willing to do this for you at little to no charge, and will dispose of the water/fuel solution in an environmentally friendly manner.

4) Diesel engines are “oil burners”, typically burning some of the engine’s lubricating oil during normal operation. This is why it’s so important to check your diesel’s oil levels often, even between oil changes! Before checking the oil, make sure the vehicle is level and allow the engine to cool for at least 30 minutes. Your owner’s manual will explain how to determine if you need to add more oil, based on your engine’s dipstick reading.

5) Diesel engines don’t like cold temperatures. At low temperatures, diesel engines tend to start harshly and warm-up very slowly. At extremely low temperatures (below -10 F) diesel engines may not function at all. Thus, it’s very important to remember to use your diesel’s block heater if outside temps ever dip below zero. The block heater is nothing more than an electrical plug on your car that uses your home’s electricity to keep your engine warm, and it’s as simple as plugging your car in at night. If you can afford the electricity, you can plug-in your block heater any time the outside temperature dips below freezing. This will protect your engine and make for quick and smooth start-ups, and it will help your engine warm-up quickly. Check your owner’s manual for your block heater’s location.

6) While all new engines have a short break-in period, new diesel engines usually have a break-in period that lasts 500 or 1000 miles. (Check your manual to find out.) Usually, the manufacturer recommends that you avoid driving at sustained speeds (i.e. long trips on the highway) during this period. Additionally, most manufacturers suggest that you not tow or haul anything during this period. Once the initial break-in period is over, it’s not uncommon for your diesel to continue to improve in power and efficiency for the first 20k or 30k miles. Unlike gas motors, which often stop improving in power and efficiency after 3k to 5k miles, diesels need lots of time and use to reach their peak efficiency and performance. In fact, most long-time diesel owners will tell you that their engine didn’t really start to truly perform until a year or two after they bought it.

Overall, it’s very important for new diesel owners to familiarize themselves with their engine manual. Diesel owners need to pay close attention to air and fuel filter warnings, check engine oil between scheduled changes, purge water from the fuel system as needed, and use the block heater during colder temperatures. This may seem like a lot of work to perform on top of regular vehicle maintenance, but the reward will be power, fuel efficiency, and 200,000+ of great performance.