Yes, you are correct. The S1s had a hydraulic pump and the driven gears for this could develop play even at low mileage. I explained how to check for this play in an earlier post. My car at 66,500km still has the hydraulic pump and there is little play.
When replaced dealers installed electric pumps and these were then installed on all Aeros as standard at some point. Maybe S3?
IIRC cars new Aeros are now once again fitted with a hydraulic pump but don't quote me on this.
