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Drained old fluid and filters I changed Allison oil filters (4 inch long) measured 6.5 gallons out, refilled with 6.5 gallons, drove bus 20 miles parked in rv building leveled bus with engine running pulled dip stick and just a little under the hot full mark, Pushes up and down arrows and came up O L then O K , Never knew how that worked before if dip stick is just a little under full and it says O K don’t add??