I've been using HPL NO VII oil for 3 oil changes now in my 6.6L gas GMC 3500.
It burns about 1/2qt in 7,500 miles.
I used Amsoil 5w30 signature series before. It didn't burn ANY oil with it.
Not sure why it's burning the HPL. 🤔
I learned the hard way when you stray from the original equipment fluid.
These transmissions now have adaptive learning.
When you change the fluid to something else it makes the transmission shift like 💩
I will never do that again.
In my race car with solid roller cam Amsoil 20w50 racing oil was the quietest
Followed by Pennzoil 25w50 and Brad Penn 20w50.
I'm due for a rebuild now and will try HPL 10w50 next.
I laugh every time I see someone say....I bought some HPL EC. Mixed it with 1qt of GTX, 1QT of Pennzoil, and 3 Qt's of Mobil. 🤣👀
Can you say additive clash and Super wear.