RepairPal Blog: Mechanic's Corner

Advice from experts concerning automotive parts, repairs, and services

Everyone knows what an engine is, right? It’s what makes your car go! But how does it work? Let’s take a closer look; it’s not as complicated as it seems.

Since we started using synthetic oil, the quandary has always been how often to change it. There is no question synthetic engine oil lasts longer than conventional mineral-based oil. However, most synthetic oil manufacturers simply defer to the auto manufacturer’s recommended oil change intervals. 

Everyone in my generation (fifty-something) and older grew up with cars that required a tune-up as often as every year or 12,000 miles. There were moving parts (ignition points) inside the distributor to wear, and additives in the gas (lead) that left deposits on the spark plugs. As preventive maintenance, the fuel and air filters and PCV valve were commonly replaced, as well. Carburetor adjustments and ignition timing were also checked as part of a tune-up.

Lately, some of us at RepairPal have been traveling to different auto repair shops in our area. Our goal is to determine what makes a great repair shop. From a technical side, that is pretty easy for us to determine. We can look at the training, qualifications, and years of experience of the service advisers and technicians.

The automobiles and trucks being produced today are some of the most technically advanced machines ever built. They are by far the most complex machine any of us will own, yet they are commonly taken for granted. And if they break down before reaching 100k miles, we are disappointed.

Few topics in the automotive repair business are as controversial and confrontational as the fee for a diagnosis. Should a customer have to pay for the time the mechanic spends figuring out what is wrong with a vehicle or only for the repairs he or she actually makes? These days, don't technicians just plug the car into a computer to figure out what's wrong? Everyone, from consumers to advice columnists, have a strong opinion on this topic. But what’s missing is a technician’s point of view on the subject, so here goes …

I happen to really like tires—a lot! I find them to be very intriguing and next to the brakes, they are the most important safety feature on your vehicle. Tires tell a great story about the car they are on. If you take a look at the tread on your tires, it is very similar to the tread pattern on your shoes. On your shoes, you can see which part of the foot you favor by the wear pattern on the soles. If you lean to the left when you walk, your soles will show it. If you turn your feet out when you walk, it's all there on the bottom of your shoes. And for those of you who get holes in the center of your soles, it's because you are putting a lot of pressure on the front of your feet. Your shoe soles reveal a lot about how you walk.

When you go to start your car in the morning, you see a puddle of fluid underneath the vehicle. Maybe it's brown in color, or red. Maybe it looks oily or smells funny. No matter what the case, most of the time, puddles underneath your vehicle indicate that something is wrong.If something has metal parts and moves, then fluid is most likely lubricating it. There are lots of moving parts in a car and many kinds of fluids. Fortunately, fluids differ in color, texture, and smell. Once you know what to look for, finding the source of your leak is much easier.

Most every one, at one time or another has been told the “best” way to break-in the engine of your new car or light truck. Some say no break-in is necessary; others say push it hard from the very beginning, 500 mile break-in, 3000 mile brake-in – who is correct!As times have changed engine technology and engine machining abilities have changed. As a result the recommend break-in procedure has changed with the times. Older cars required a longer break-in period (up to 3000 miles) than our newer cars. Because our new engines have better machined cylinder bores, higher tension piston rings and over all more precise build tolerances most manufactures advise only a very modest break-in period of 500 miles (check your owner’s manual for specific recommendations).

A/C not working? What is necessary to get to the bottom of what is wrong. The first step in any diagnoses is to confirm the fault. Possibilities include: A/C not cold, abnormal noise, incorrect air flow, or poor air flow. Once the problem has be determined then diagnoses can begin. Is is quite possible to have more that one of these conditions present at the same tine. Here is a brief overview of each problem and some diagnostic procedures.