Mendo......if you already have it....use it. Usually each succession of DEXRON product is compatible with the previous formula designed for an earlier transmission. Read the back label. It is Ok to go up ie. DEXIII to DEXVI but not down.

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FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K