4 1/2 or 5 quarts of oil with 1/2 quart of ZZDP?

rumblefish360 said

Does it come in other grades? 10/30?

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No, the xW-30 grades have either significantly less or more ZDDP. The Mobil1 FS 0W-40 is in the lower end of the viscosity range for a grade 40, just a skosh heavier than a 30. So, unless it's critical to have a grade 30, it should be fine.