Zinc oil additives

Swinger 340 said

I have a 2005 Cummings diesel that I use Rotela, 15 - 40, sense new (200,000 miles, now), I was wanting to use the same in my 69' 340 Dart, but was told (don't remember who) that it was not good for my flat tappet cam. I do add an additive, but would rather just use the Rotela for both. Any input?

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I myself had a bad experience with the rotella in my duster when I had it. soon as I fired it up lifter noises scared me and the oil pressure went up to 80pounds I got afraid that I was going to blow the seals out the engine so drained it out and used 5 quarts of Castrol 10w40 with a bottle of STP and it quieted down I know everyone uses rotella 15w40 and have no problems . I'm just Leary about using it I have my 318 1973 valiant and I use Valvoline 10w40 with STP additive and it works but that engine is all original never been rebuilt what works for me may not work on others I live in north Carolina so I use 10w 40 if I was in Florida I would use 10w 50 . if I was in NY I would use 10w30 because of temperature and altitude this is just my experience of what I've experienced