According to the TRW/Ross website (I'm assuming you have the same Ross steering gear my 77 coach has) you can use Dexron, ATF E or A, Shell Rotella SAE 30, or most 10W30, 15-40 and 10W40 engine oils. Prior to overhauling my steering gear I had used Dexron but afterward I used Mobil 1 5W40 and it works just fine. Prior to the overhaul I tried some steering gear additives that basically were just thick oil and that seemed to improve my steering so that became the basis of my subsequent choice. While the Mobil 1 was not specifically approved I believed it would hold up better than dino oil
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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