|
Read the definition of "severe service" in the manual.
If you are doing all highway driving at moderate temperatures, you use the higher change interval (though some of the 15k intervals that got published soon got changed to 10k).
But most of us drive in the cold, the heat, in traffic, in dusty conditions, with the a/c adding heat, for short trips, etc. And those call for cutting the interval in half.
I always did 5k or 1 year for my 986s with the M96.
I always believed the extended change intervals were marketing driven making the maintenance costs look good in magazine reviews long term reliability be darned.
Just as I still believe in 1k for the first change on a new or rebuilt engine.
Oil is cheap, engines aren't.
Yes, you can always get an oil analysis and see how your oil with your kind of driving is holding up.
|