My 99 typically went 16-18k between changes. It was heavy on highway miles so easy on oil. Blackstone labs always showed the oil had plenty of life left even at that useage.

You can't find this oil which meets spec locally?
0W-40 Synthetic Oil | Mobil 1™ 0W-40

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)