Some new are now recommending much higher oil change intervals than they have in the past. As much as 5,000 to 10,000 miles, or 10,000 to 15,000 kilometers, or more. Following these recommendations is very important to avoid engine damage. When Portland drivers go too long between oil changes, oil starts to turn to sludge. This causes small oil passages to clog and engine parts to fail.
What causes oil sl... read more