I put Royal Purple in my engine as a "century" gift (100K miles) to my truck. I used a K&N oil filter. This was on January 2nd, 2008. I have only put on 9K miles since then. Royal Purple says you can go 12K on it. I got nervous around June (6K miles) and changed the filter, which required I add another fresh quart. Other than that, I'm running on year-old oil.
I rarely tow or drive in much traffic. Generally, it's only off road 3-4 times a year and that is light too. Just fire roads and two tracks, no mud-bogging or hill climbing. The oil still looks OK.
Anyone see a problem with this? A whole year (9,000 miles) on the same oil change?
Thinking about going on the annual system with my Focus...
I rarely tow or drive in much traffic. Generally, it's only off road 3-4 times a year and that is light too. Just fire roads and two tracks, no mud-bogging or hill climbing. The oil still looks OK.
Anyone see a problem with this? A whole year (9,000 miles) on the same oil change?
Thinking about going on the annual system with my Focus...