I installed dual Frantz bypass filters with 1000 miles on the oil change. I added 2 qts for the added capacity at that time. With 3000 miles on the oil, I changed the TP and added the other 2 qts at that time. I started out with the Frantz in series, but the flow slowed considerably, so I replumbed them in parallel. Both mounted side by side under the hood
I am happy w/ numbers, I was planning on going to 7500 mi (severe duty maint. sched.) if #'s looked good, and Blackstone apparently agrees. Any comments will be welcomed.
Tom.