Originally Posted By: Merkava_4
You didn't change the oil in your taxi until 6000 miles ? Are you serious ? Are you seriously serious ?
Very serious, Merk. The recommended interval at the time was 3000 miles, and we went 6000, and it was oils not nearly as good as we get today. And, they were conventional, too. Now, as Nick indicates, I, too, don't call taxis exactly severe service, since they're always at operating temperature, so few concerns about condensation in the oil, or cold starts, or any of that.
But, none of the engines wore out before the bodies. The longest run we had was a 600,000 mile Impala, driven to its retirement spot on the farm because the body had simply had enough. And, when I did cam and lifters on it a couple hundred thousand miles into its service life (they all went through cam and lifters then), there was no horrible sludge or me sitting there for hours cleaning things. It wasn't as clean as I know you like things, but when you do the math on cutting the OCI in half over that kind of service life, you can see things get pretty expensive. An oil change would cost roughly $7.50. So, we basically had 100 oil changes for $750. There is no financial reason whatsoever to halve the OCI and spend an extra $750, considering the engines were never the limiting factor on the taxis' service life. For an extra $750, I could have had an extra engine sitting on a stand, ready to go in, in case of an engine wearing out that never happened in the first place.