Timely Oil Changes

427435 wrote:

jhilley wrote:
I run about 6,000 miles between oil changes and have the oil tested at

Blackstone Labs

The tests confirm that I could go a little farther between oil changes, so 7,500 miles should be ok. This is with quite a bit of mountain and hot weather driving pulling a Jeep Cherokee.

It is good to get an oil analysis just to see how your engine is wearing.

X2

Having your oil tested is the smartest way of doing it.

I'm not sure I understand the usefulness of this test as it relates to change interval. I see no place where it tells you how much additives are still in your oil. while it gives an indication of wear, it is telling you after the fact. for example, how do you know if the oil still has enough zddp in it? if you are starting to see increased wear, you are finding out after the fact - after the increase has occurred is too late.