Autran DX III (H). Autran MBX. Bucher + Cie AG. Motorex ATF Dexron III H . SKL ATF B (J/). Dexron VI ATF (J). Slovnaft JS Co. Autran – Castrol – PDS & MSDS Search. Text; Aquatic, · Exposure, · Belgium, · Regulation, · Annex, · Environmental, · Disposal, · Autran. OIL BP AUTRAN MBX 53KG DRUM – AUTOMATIC TRANSMISSION BP SUPER OUTBORD SPEZ B 12X1 LTR OIL BP VISCO 10W
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However, in the list above there are oils mentioned which are fully synthetic so I may just bite the bullet. You aren’t likely to buy DVl by mistake, I don’t think it’s widely seen on accessory shop shelves and is very expensive.
Technically Dexron ll and lll no longer exist – GM who own the names and technical authority have discontinued support. Oil incompatibility with elastomer O rings is not a problem that shows itself immediately, and this is a problem well known and documented within the refrigeration industry.
The current Tellus range differs enormously from what it was 20 years ago, for example. This has led to some incompatibility problems even within the Shell catalogue. If anyone would like a copy of the full document which covers many of the other gearboxes, send me a PM with their email address and I will reply with a copy of the full pdf document.
I understand that DVl is not recommended for mechanical clutch gearboxes – too slippery. I cannot quote you gospel but believe this is why VP changed to specifying engine oil instead of Aufran for gearboxes and saildrives, in case anyone used DVl instead of Dll or Dlll. The following oils are suitable for these gearboxes List from ZF was dated Feb The list was dated Feb Yes, that was what I suspected, and why I responded to Bobc’s ‘So any ATF basically then’ comment – though I agree you’d have to go out of your way and pocket!
Ignore the ZF number at the end as that is the ZF approval number.
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When you read through the many postings there have been on this and many other sailing and marine forums, there are warnings of issues with the clutch plates slipping when using ATF Synthetic oil and that is what I have.
Thank you for the post on oil seals which was my main worry. I can see the logic of keeping to the same oil type so will be changing my bottle of Halfords fully synthetic to straight ATF. ATF is what is called for! However equivalent of Dlll is readily available from any car shop under lots of names. This was a widespread problem in extensive systems that for instance supermarkets use, and 6 – 18 months after oil change the problems of leakage became obvious.
When the oil is changed only the free oil drains out, leaving that absorbed into the O ring where it is. I cannot speak for any other oil manufacturers but the composition of Shell grades has changed markedly over the years. It would be interesting to know how regularly that list is updated. A typical nitrile O ring will absorb mineral oil, but not certain synthetics. Well an O ring that has been in contact for many years with mineral oil will likely have absorbed some.
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To some extent its an age thing, not the oil, me! I gather from Wiki that there is no Dexron D-IV grade it was never approved by GMthough there is a D-VI which is of slightly lower viscosity than D-III when new, but with lower permitted viscosity loss from shearing in use — so the allowed final viscosity is the same.
My other concern autra that there are stories of oil seal problems when changing from straight mineral oil to synthetic oil and my gearbox is 18 years old but has only had about 7 years actual use since Therefore returning to the subject of what ATF to use, then it may pay to avoid a synthetic in a box always previously filled with mineral base ATF, if an alternative mineral base remains available. I think that also used to have ATF specified.
However, over a period of time as the synthetic oil meets the O ring it tends to leech out the traces of mineral oil the Auttran ring had absorbed, but the synthetic does replace this oil, with the result that the O ring disintegrates into a snotty mess, and leaks then develop.
So any ATF basically then.