Hello St. Peter – let’s talk differentials. If you have a rear-wheel drive vehicle, your differential is on the back axle. With front-wheel drive cars, the differential is up front. All-wheel drive and 4-wheel drive vehicles have three differentials – front, rear and in the middle. So you see, you’ve got a differential (or two or three) and it needs service now and then.

What does your vehicle differential do? Well, it compensates for the differences in speed between your outer and inner wheels in a turn. Using the dimensions of a typical car, let’s compare the distance the wheels travel from the start of a turn through to the completion of the turn.

The inside wheel travels about 12.6 feet/3.8 meters. How much farther does the outside wheel travel? About 18.8 feet/5.7 meters – over 6 feet/1.9 meters more. This means the outer tire has to rotate 9 times in the same amount of time that the inner tire has to rotate only 6 times – so the outer tire has to spin faster in order to keep up. The differential makes this possible.

The gears in the differential are cooled and lubricated by differential fluid. It’s this fluid that needs to be serviced. Small bits of the gears break off and are suspended in the differential fluid. The dirtier the fluid, the faster the gears wear.

So your Autotronics of St. Peter technician drains the old fluid out and replaces it with fresh fluid. Some differentials also need a special additive that is put in at this time.

So when should you have your vehicle differential serviced? Intervals vary from vehicle to vehicle – and may be as short as 15,000 miles/24,000 km – so check your vehicle owner’s manual or ask us at Autotronics of St. Peter. If you frequently drive with heavy loads, tow a trailer or drive in hot MN conditions, you may need to change differential fluid more often. Servicing your differential on schedule at Autotronics of St. Peter can save a pricey replacement down the road.

Give us a call.

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

So your vehicle won’t start.  What’s the first thing that comes to mind?  Battery dead? Starter motor worn out? Out of gas?  Well, those are all reasons that make sense.  But your vehicle may be refusing to start because one of its computers is being warned that to do so might damage it.  Here’s how that works.

You have lots of computers in your vehicle.  They need to know the status of things so there are several sensors monitoring various things going on.  These sensors send information to the computers that adjust the fuel and air mixture so you don’t waste fuel.  They know when things aren’t quite right and prevent you from starting your engine if that’s going to damage it. 

Other sensors make sure the coolant is the right temperature, check to see you are not polluting the air and make sure other electronic components are performing their tasks correctly.

Here’s an example of a sensor doing its job.  Your engine needs oil to lubricate metal components so the friction doesn’t damage them.  Your engine has an oil pressure sensor that tells a computer called the Electronic Control Unit (ECU) if things are good to go or if there’s something wrong, maybe the oil pressure is too low to keep things lubricated.  If it is, it gives a signal for the vehicle not to start, protecting the engine. 

Of course, the sensors can go bad, too, with some of the same results.  And so someone has to figure out if it’s the sensor that’s failed or if it really has detected a problem.  That is the challenge for technicians with specialized equipment to decipher the signs.  If a bad sensor is found, it may need to be replaced.  Sometimes a thorough cleaning can do the trick.  In either case, your service facility can track down the problem and get you back on the road.  Makes sense, doesn’t it?

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

Everyone in St. Peter, MN, knows we are advised to go to our St. Peter dentist twice a year.  Oral-conscious St. Peter residents have a teeth-cleaning and examination. Once a year, we get x-rays to look for problems that can’t be seen with the naked eye. When our dentist is done, he/she tells us what was found – “Everything’s fine, see you in six months.” Or “You’ve got a small cavity starting, let’s schedule an appointment to take care of it.” By the time you leave, you have a plan for addressing any necessary issues.

This system works so much better than waiting for a painful problem before going into the dentist. Small problems are fixed before they turn into big problems. And you avoid those huge bills.

If St. Peter folks understand the wisdom of using this system for handling dental care, why do many resist when facing the same system for our vehicle maintenance?

Following the vehicle manufacturer’s recommended intervals can be confusing. First, there are recommendations for so many things: oil changes, transmission, coolant, air conditioning, power steering, brakes, fuel system, filters, belts, hoses, alignment, rotation, balancing …you get the point.

Every item has a recommended interval and it’s hard for St. Peter drivers to keep it all straight – even if you’re part of the 1% of MN drivers that read their owners’ manual.

And if you have more than one vehicle, the complexity is multiplied. You’d need a computer to keep track of everything. Well, that’s how your service center does it. For example, Autotronics of St. Peter subscribes to automotive databases that have your vehicle’s recommended intervals. You may have wondered how they know what else to recommend when you take your car in for an oil change – it’s all in the database.

Well, it’s not all in the computer. There are other variables that can’t be accounted for in the schedule: Things like St. Peter weather conditions, altitude, and where and how you drive in MN. Talk about these things with your service advisor at Autotronics of St. Peter and you may decide that the severe service schedule in your owner’s manual is more appropriate.

Since anything that’s not driving in moderate weather is considered severe and most of us do at least some of that around St. Peter, MN, it should be taken into account.

Let’s take your basic oil change as an example. What issues are involved? The oil you put in your vehicle is a blend of base oil and special additives. There are detergents to clean the inside of your vehicle engine and corrosion inhibitors. A good quality motor oil will not only lubricate your engine, it will help it stay clean inside and run cooler.

Now, these additives deplete with use and time. That’s why most vehicle manufacturer’s maintenance recommendations include both a time and mileage element – like 3 months or 3,000 miles/5,000 km, whichever comes first.

It’s easy for St. Peter drivers to think, “Gee, I’ve only driven 2,000 miles/3,200 km in the last 3 months. I can wait on that oil change.” But you need to remember that the inside of your engine is a environment. The oil is contaminated with combustion by-products that start degrading its effectiveness even when it’s just sitting there.

A lot of people in St. Peter don’t realize how harmful it is to skip an oil change. There are a lot of metal parts moving around in your engine. Small bits of metal wear off and are floating around in your oil. They can be carried to more delicate areas of the engine where they cause damage. Your oil filter is designed to trap metal particles and other dirt, but if it’s clogged up because you haven’t changed it, it can’t trap any more.

Oil sludge is another problem for St. Peter vehicles. Sludge is oil that has turned to a gunky jelly – think ‘Vaseline.’ Obviously, sludge doesn’t lubricate. It can also clog small oil passages so that all the parts don’t get properly protected by the oil. That’ll lead to premature wear.

If you’ve missed some oil changes, don’t despair. Just talk with the pros at Autotronics of St. Peter. Fess up – you’ll feel better. And they can help you get back on track. Following recommended intervals is the key to keeping your vehicle on the road and avoiding repairs.

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