I didn’t have good result with Dexton III, I did a fluid/filter change only to find the local autoshop only stocked Castrol ATF TQ dexron III, so assuming this would be a better advanced product, I filled her up. As soon as the transmission had reach normal operating temperate there was a loud buzzing noise coming from the box. I contacted Castrol Tech Dept and they confirmed that Dexton III is a GM fluid, and not meant for the A340 boxes. Managed to find some Castrol TQ-D which is dexron II and did another fluid change, that was 3 years ago and I haven’t had a problem since.
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