rednotch
Founding Member
I " think" I just read something about Rotella reducing their Zinc content recently...
Pickup & Passenger Vehicle Diesel Engine Oil FAQs
Your resource for frequently asked questions related to diesel motor oil for diesel pickup trucks & other passenger vehicles that are answered by Shell’s technical team.
rotella.shell.com
First question is about t6 but there reply "Most Shell Rotella engine oils, including T6 5W-40 Full Synthetic Heavy Duty Diesel Engine Oil, contain approximately 1200 ppm of zinc which will benefit older and high-performance engines." Pretty much anything the sell for "older" formulations is still 1200ppm