Originally Posted by zachakamp
2013 Chrysler 300, 3.6L Pentastar
50,000 miles on engine; 10,000 miles/1 year on oil (5W-20)
I had four quarts of AMSOIL Signature Series, which I used along with two quarts of Pennzoil Platinum.
You answered your own question, and I highlighted it for you....you can't denigrate an oil that you mixed with another brand; the thread title is very misleading and could have been "Disappointing results with Pennzoil Platinum" instead.
I totally agree with bullwinkle - you should fill 100% Amsoil and try again. Personally, I'd use 5w-30 since that is what was originally specified for the Pentastar.
Originally Posted by addyguy
15k OR 1 year, whatever comes first.
For an entire year of short trips, the oil did fine.
Yup, the results were decent...bet they'd have been much better with a 100% fill of either oil
Originally Posted by PPWarrior
Oil should not be used for more than 7,500 miles TOPS.
You deserve the disappointing analysis.
You, sir, have just proved that you need to do a LOT more reading on the site.