J/w for those w/ over 75K have you guys tried Castrol GTX High Mileage oil and are you happy w/ the results?

 

Unless you have oil leaks, stick with the Castrol GTX. The high mileage formula contains some esters to help swell old and worn seals.

This is a better solution, http://www.auto-rx.com

 

I've not used Castrol HM. However I have used Penn HM in my Club Wagon that has 100K and a pesky leak. It didn't help the leak much at all. Oil consumption did lessen however...probably because the PHM oil is blended on the higher end of the viscosity range for a 30W oil. I used auto-rx to stop the leak, which it did in my case...so far. I'm not a zealot of that product trying to endorse it, but I did use it. From what I've read, Castrol HM is a good product. I debated between that brand and Pennzoil frankly. They are probably very comperable. I wouldn't use Maxlife.

I suspect one needs to stay with a high mileage oil for awhile, before any sustained improvements are seen. One or two oil changes aren't enough time. Don't ask me why I say that, just my "woman's intuition."

Nonetheless, I am going to stop using PHM at my next change. Aside from controling my leak, I see no value in running a higher cost HM oil. I want to see if the leak stays dead with a regular oil (Havoline) now that the auto-rx has worked it's hucus pocus.