Hungry Joe, lot of good comments already posted. Red Line says their oils are good for 10,000-18,000 miles for a gas engine and 10,000-12,000 for diesels ... or one year, whichever comes first.
However, when considering these kinds of intervals, it's best to do some testing to verify that the oil's still doing its job properly at 5,000+ miles. Be sure that TBN is still in the safe range, the oil hasn't oxidized and few contaminants (like silica/dirt or antifreeze) are making their way into your oil. Red Line's maximum recommended intervals are for cars in near-perfect condition.
I went 7,200 miles on my '95 Honda Civic for the past two changes in a row using Red Line 10W30 and then 5W30 and my testing was just OK. You can see it in the oil analysis section on this site. My car has other "issues" I have to look into.
![[Roll Eyes]](images/icons/rolleyes.gif)
And, if you are at all anal retentive and like the inside of your motor to be super-duper clean, I don't think you'll be happy with any oil and extended intervals. They seem to leave a fair amount of light staining behind.
![[Razz]](images/icons/tongue.gif)
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Bror Jace
””I was a patriot before being a patriot was cool.”” ![[Patriot]](/forums/graemlins/patriot.gif)