Apparently, Chrysler produced different, two to be exact.
For passenger cars they used a -15F from 62-68 and a -20F for 69-73. My 68 along with another 68 core support has a -20 on it.
So, we seem to have some difference between trucks and passenger cars. The earlier one also is printed "-15F with Mopar Antifreeze" and the late one is printed "-20F with Chrysler Antifreeze".
Looking for some input, to find out when the transition was made and what some of your trucks have on them.
Thanks
Mark D.
1968 W200 Sweptline
1969 D100 Utiline
1971 D100 SE Sweptline
1993 D250 Club Cab Sweptline
1986 W250 Cab & Chassis
1978 D300 Sweptline
E. Brookfield, Massachusetts