What the factory says about oil changes
Open the owner's manual of a newer BMW, Mercedes-Benz, Audi or Volkswagen. Many say to change oil every 10,000 to 15,000 miles. Some say once a year. The dash may count down the miles for you.
Those numbers assume long highway drives and mild weather. They also assume the oil level stays full. Real life in Athens, GA does not look like that. Short trips, heat and traffic are normal here.
At Athens Import Auto Repair, we have watched these intervals grow over the years. James has worked on European cars since 1972. Engines got tighter and hotter in that time. Oil still wears out. We tell our customers what we would do with our own cars.
The long-life oil myth
Long-life oil is real. It is a full synthetic oil built to last longer than old oils. But it does not last forever. Heat breaks it down. Fuel and water get into it. Tiny bits of metal and carbon float in it.
By 10,000 miles, that oil is dark and thin. It does not protect like it did on day one. Dirty oil is hard on timing chains, turbos and the small oil passages in modern engines.
We also see European engines that use oil between changes. That is normal for many of them. But if the level drops low over a long interval, the engine runs starved.
Use the oil spec in your owner's manual
The oil brand matters less than the spec. BMW, Mercedes-Benz, Volkswagen and Audi each have their own approval codes. The oil has to meet the code for your engine. Look for the oil spec in your owner's manual, or ask us.
An oil that says European formula on the jug may not meet your car's spec. The wrong oil can harm the engine, the turbo and some emissions parts. The same goes for the filter. We use the oil and filter that meet your car's spec.
Not sure which spec your car takes? Bring the manual, or call us with the year and model. We will tell you what it needs.
Why 5,000 to 7,500 miles is the safer interval
For many owners, 5,000 to 7,500 miles is the sweet spot. It keeps the oil clean enough to do its job. Here is why it fits driving around Athens, Clarke County and Oconee County.
- Georgia summers push oil temps up for months at a time.
- Short trips to campus or the store never get the oil fully hot. Water and fuel build up in it.
- Stop and go traffic on Lexington Road and the Loop is hard on oil.
- Many European engines have turbos. Turbos run very hot and need clean oil.
- Clean oil helps timing chains and guides last longer.
- An oil change costs far less than an engine repair.
Check your oil between changes
Check your oil level once a month. Many European cars use some oil and that is normal. Some newer BMW and Mercedes-Benz cars have no dipstick. You check the level on the dash screen instead.
If the level is low, add the right oil right away. If you add oil often, tell us. It could be a leak or a worn part. Not sure what your car needs? Call us and we will talk it through.
Key takeaways
- Change oil every 5,000 to 7,500 miles, or once a year.
- Long-life oil is good oil, but it still wears out.
- Use the exact oil spec in your owner's manual.
- Georgia heat and short trips are hard on oil.
- Check your oil level once a month.
