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For street vehicles like your 250 etc etc, it will be fine regardless of the formula change.
We did see a change in lifters that came out of a race motor with the newer formula.
I personally wouldn't use the new formula for anything high performance solid lifter.
Mobil 1 has also gone thru many changes.
For racing it was good, then it was bad, then it was good again. I haven't been using it except in my Lightning Motor truck and have had 25,000 flawless miles so, I guess it's good in that application.
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