Problems to address before pouring fresh oil — because new oil won’t fix an existing leak or worn component.
Fresh oil is only as good as the system it runs through. If your engine has leaks, worn gaskets, or other issues, changing the oil without fixing them first means you’re wasting money and leaving the real problem untouched.
1. Oil Leaks
If you see dark spots under your car after parking, you likely have an oil leak. Common sources are the valve cover gasket, oil pan gasket, and oil drain plug. Pouring new oil into a leaking engine means you’ll be low again within days. Fix the leak first, then change the oil.
2. Worn Valve Cover Gaskets
The valve cover gasket seals the top of the engine. Over time, heat and age cause it to crack and harden, leading to oil seeping out and sometimes dripping onto hot exhaust components — which you’ll smell as burning oil. This is a common and affordable repair that should happen before your next oil change if you notice the signs.
3. Spark Plugs Due for Replacement
Oil changes are a good reminder to check your spark plugs. Worn spark plugs cause rough idling, poor fuel economy, and difficulty starting. Replacement intervals depend on the type: copper/nickel plugs last about 25,000–30,000 km, platinum plugs last 40,000–50,000 km, and iridium plugs can go 60,000–75,000 km. Ask your technician to inspect them at your next oil service.