The ULTRA should be fine .
Old , but still applies .
The P.U. is within range of the ZINC and PHOSPHORUS along with the CALCIUM . So , all should be good for L.S.P.I. and catalytic converter . The S.N. Plus below should be similar to S.P..
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V.O.A.s , the P.U. is to the far right .
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May want to E-mail PENNZOIL technical and get verification that the ULTRA is GM Dexos1 , Generation 3 and can be used in a D.I. engine for warranty .
Looks like NAPA has ULTRA on sale . 5 quart jug at $34.99 and quarts at $7.69 .