Today’s Autotronics of St. Peter article focuses on severe service maintenance. Many St. Peter drivers are not aware of them and yet there are also very vocal advocates in MN who think that severe service schedules apply to everyone. Somewhere between a complete lack of awareness and the dire blanket statements lies a reasonable approach to severe service maintenance at Autotronics of St. Peter.

To back up a little, vehicle owner’s manuals have schedules for preventive maintenance: things like oil changes, transmission service and so on. They say you should change your oil after a certain distanced traveled or after so many months. St. Peter drivers understand this very well. What they may not know is that there are actually two service schedules: the regular schedule and the severe service schedule. The mileage and time intervals are lower on the severe service schedule.

Now when you hear ‘severe service,’ you may think it doesn’t apply to you because you don’t feel your driving conditions are severe or extreme – it’s just normal everyday driving in the St. Peter area. So let’s list some of the conditions that classify as severe so that you can make the judgment on your own driving.

Before we start the list, here’s a point of contrast that definitely is not severe driving. Driving down your nearest MN interstate at the highway speed limit on a 75 degree F/24 degree C day loaded only with your passengers. This is an easy trip for your vehicle: your engine is loafing along at low RPMs, no heavy loads to pull and moderate St. Peter temperatures. Now let’s look at some severe service driving conditions.

Most trips around St. Peter are less than four miles/six and a half kilometers. When your vehicle engine cools down, moisture condenses in the engine. This water in the oil doesn’t get a chance to evaporate on short trips because the oil doesn’t get hot enough. A lot of short trips in your vehicle means a lot of water build up. And water in the oil leads to the creation of sludge which can damage the engine. Changing the oil more frequently keeps sludge from building up. By contrast, highway driving warms the engine up and gets the water burned off.

Here’s another example. Most trips around St. Peter are less than 10 miles/16 km and outside temperatures are below freezing. This is the same reasoning, but in very cold MN weather it takes even longer for the oil to get hot enough to evaporate the water, hence 10  miles/16 km as opposed to 4 miles/6.4 km.

Next, you drive in very hot MN weather. The hotter it is outside, the more cooling the engine, transmission, brake fluid and so on becomes. The environment in which the fluids reside is more hostile, and the fluids simply break down faster. Therefore, the lower change interval.

Another: driving at low speed most of the time. Every vehicle engine has what’s called its power band. This is a range of RPMs in which it’s most efficient. Low speed driving doesn’t keep the engine in its power band so it’s working harder. This is one of the reasons that ratings are worse in downtown than on the highway.

Stop and go driving in St. Peter is another severe service condition. You’re always accelerating, which works the vehicle engine and transmission harder. Then you’re stopping, which works the brake fluid harder, causing it to get very hot. Highway driving, on the other hand, requires far less horsepower to maintain its speed than getting a stationary vehicle from a stop light up to 25 mph/40 kph. A lot of this and you’ll need to follow the severe service schedule.

Also on the list is operating your vehicle in dusty, polluted or muddy conditions. Obviously, your engine air filter and cabin air will get dirty faster and need to be changed more frequently as will your breather element. Some of this dust and dirt will make its way into your fluids. They will simple get dirty faster and won’t protect the components as well as fresh fluids.

Finally, you’re driving under severe conditions in St. Peter when you tow a trailer, regularly carry heavy loads or carry a car-top carrier. This is pretty obvious. You’ll spend more time in lower gears so the engine and transmission work much harder and create more heat. Brakes will be more stressed stopping the heavier loads.

Sounds like most of us in St. Peter operate under severe driving conditions at least some of the time. How can St. Peter drivers know which schedule to follow?

Think of it as a spectrum with “always driving under severe conditions” on one end and “never driving under severe conditions” on the other end. Some will be at one extreme or the other, but most of us will fall somewhere in between.

Carefully think about your driving conditions and decide if you should do your preventive maintenance closer to the severe service recommendation or the regular recommendation. Of course, your Autotronics of St. Peter service advisor can help you with your decision.

Autotronics of St. Peter
111 Jefferson Avenue
St. Peter, MN 56082
507.934.9290
http://autotronicsstpeter.com

Your parents probably taught you to have common sense. When it comes to your vehicle, common scents can also come in handy. Different smells may tell you about some conditions in your vehicle that need attention.

For example, you know what rotten eggs smell like.  If you smell them around your vehicle, it means sulfur can’t be far away. Here’s a surprising fact: Gasoline has a little sulfur in it.  There’s a device in your exhaust system that’s supposed to convert it to something that doesn’t pollute the atmosphere. That device is a catalytic converter.  If you are smelling rotten eggs, maybe your catalytic converter is wearing out.  But it could also be a problem with your fuel injectors.  Either way, something’s rotten that should be repaired.

Ever smell something sweet around your vehicle, maybe a little like pancake syrup? If you sniff out a little sweetness just when your engine is warming up or after you shut off your engine, you might be smelling some coolant (anti-freeze).  If it’s leaking, then you may be getting a whiff of ethylene glycol, one of the coolant’s components.  If the odor is strong inside the car, it could be a leaky heater core. This is important to get checked out because a leak in your vehicle’s cooling system can eventually cause expensive damage.

How about that distinctive smell of gasoline? You could have a leak in your gas tank, a hose that vents your gas tank or a leak in a fuel injector line.  A gasoline leak needs to be tracked down since it could catch fire.  It can also be bad for your health if you breathe it in all the time.

When you step hard on the brakes, ever smell something like a rug’s in fire? That could mean you’ve just overheated your brake pads.  If you detect that smell just driving around town, one of the brake calipers could be stuck.  To figure out which wheel has the problem, get out of your vehicle and smell each wheel.  It will likely be obvious where the problem is.

Here’s one last smell.  Ever had your oil changed and right after you picked up your vehicle it smells like something’s burning around the engine? That’s because sometimes a little oil leaks onto the metal when the filter is changed or the oil is poured in.  It’s a useful smell to know.  Because of you smell burning oil and you haven’t had your oil changed recently, that could mean you have a leak in your engine.  It could be a gasket or a seal, but it also could mean the start of more serious issues. 

All of these things are signals that you should discuss with your service advisor to get them checked out.