Mix Rotella T and Rotella T4

[mrboatman]

For the past 20 years or so I've just using the cheapest oil I could find in my F engine. Now that I've been reading threads about types of oil used I feel guilty for just dump anything in. Kinda afraid the old F engine will choke and reject some decent oil. This is a good discussion about oils.
JP

 

[Mr Cimarron]

I recently switched all my vehicles from T6 to T4. Since I don’t run high mileage intervals I wanted to save some money and go back to dino oil. I had a gallon of T left over from years ago and dumped it in with the T4 with no thought to it.