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Originally Posted by KINGcabKENNY
There's no such thing as extended oil changes. I wouldn't go over 5,000 miles on any type of oil. I use synthentic now, and it get changed every 3,000 miles.
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Kenny, the days of 3000-mile oil changes are LONG GONE. Those change intervals were from the days of SC and SD oils, which WERE actually depleted in that short a time frame. Now we're up to SH and I think SJ oils, which are far superior to oils of just a decade ago. Especially with synthetic, you're changing oil WAY too often at 3000 miles. That's Jiffy Lube's mantra (3000 miles or 3 months). I bet even your owner's manual recommends longer change intervals than that.
Changing your oil too often certainly won't hurt anything, but it's also wasteful, both to your wallet and to the environment. You should (could) be going at LEAST 5k miles between changes on synthetic. In my Cadillac, I generally go 6-7k miles on conventional, especially during the summer (it has an oil life monitor, so it varies the change intervals based on the type of driving I do). On my Nissan, I generally go about 3k miles between changes, but that's only because I don't know the past maintenance history of this truck and I want to keep the engine cleaned out as good as I can.
