You have strongly urged readers to have their cars serviced regularly and recommended a benchmark interval of 5,000 km. Does that still apply if the owner uses top-of-the-range engine oils that claim to last 10,000 km or more? DLM
Yes. For several reasons. Even the best synthetic oils give “better” protection between 0 and 5,000 km than they do between 5,000 and 10,000. They constantly degrade. They never improve. And service is about much more than an engine oil change.
