Checking your engine oil is the single most valuable two-minute habit a driver can build. Oil lubricates and cools the engine, and running low or dirty can destroy it. The good news: anyone can check it, no tools required.
Before you start Park on level ground and turn off the engine. For most cars, let it sit a few minutes (or check before starting in the morning) so the oil settles into the pan and gives an accurate reading. Pop the hood and locate the dipstick, usually a brightly colored loop labeled with an oil-can symbol.
The four steps 1. Pull the dipstick out and wipe it clean with a rag or paper towel. 2. Reinsert it fully, then pull it out again, this is the reading that counts. 3. Check the level: the oil film should sit between the two marks (often MIN and MAX, or two notches). Near the lower mark means add oil; below it means add soon. 4. Note the color and feel.
What the color tells you - Amber to light brown: healthy, relatively fresh oil. - Dark brown to black: normal as oil ages, but very black and gritty means it is overdue for a change. - Milky or frothy tan: a warning sign of coolant mixing in, which needs a mechanic promptly. - A burnt smell or metallic flecks: also worth getting checked.
Topping up If the level is low, add the grade of oil specified in your manual a little at a time, rechecking after each splash. Do not overfill, which can damage seals. If you are constantly topping up, the engine is burning or leaking oil and deserves a proper look.
Make this check a monthly habit, and before any long road trip. It is the cheapest insurance your engine will ever get.