From the Castrol Edge Synthetic Oil 1 QT bottle:
“Guaranteed extended drain interval protection for 15,000 miles or one year, whichever comes first”.
I drive 20k miles a year, 95% of which is interstate highway miles @65-70 mph. I live in North Texas. I based the 6 mo/7500 mile schedule from the Camry Owner’s manual. Based on my driving habits and what Toyota recommends, can you tell me why I should change oil more frequently?
The thought of going 1 year between oil changes is appealing but not at the cost of a damaged engine.