While cleaning out the garage, I discovered a case of engine oil, 10w40. It has likely been there for 15 years. Can it be safely used after sitting around that long?
The shelf life of most conventional and synthetic motor oils is 5 years at most. The main constraint is the chemical change in, or deterioration of, the various synthesized compounds that make up the "additive package" in motor oil. YourMechanic offers oil and filter changes during mobile visits right to your location and you should certainly avail yourself of that service as the cost is lower and the service is much more personalized than at a shop or dealer. If you have additional concerns, don’t hesitate to re-contact YourMechanic.