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<p>The detergent foams when agitated. It is designed to hold particles in suspension. It works well in engines not in the gear box. Use 30 wt non detergent or MT-90 by Redline. It has been said that the detergent attacks the brass parts in the gear box. Also
that the foam lowers the oil pressure needed in the over drive valve.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Healeys <healeys-bounces@autox.team.net> on behalf of Roger Grace <roggrace@telus.net><br>
<b>Sent:</b> Friday, February 24, 2017 8:18 AM<br>
<b>To:</b> Healey List<br>
<b>Subject:</b> [Healeys] Trans oil foaming</font>
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<div>I recently had the OD on my BJ8 apart to replace some parts – bearing/accumulator/gaskets/O rings etc.</div>
<div>For a first sort of sacrificial oil fill I decided to use a non detergent Castrol 30 wt oil. Date codes less than 18 months old. Plan was to switch to the expensive Redline MT90 after testing and after a few hundred miles. This 30 WT oil is often recommended
by OD experts. I have built an electric variable speed rest rid to be able to test the transmission outside the car.</div>
<div>Overdrive worked fine and transmission sounded OK and ran it for about 2 hours to get the temp up (52C on OD case) and hunt for leaks.</div>
<div>So far so good.</div>
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<div>Then after a few days of standing, and 2 minutes of running, I drained the oil (to fix a leak) and was amazed to see that the oil had foamed badly and there were big classic fish eye bubbles on the surface of the oil. Ambient was about 14C. I did note
that the oil coming out of the transmission was somewhat foamier than that from the overdrive drain plug.</div>
<div>See enclosed pix.</div>
<div>After standing overnight the oil looked normal again.</div>
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<div>What disturbs me is that unless I had drained the oil I would not have been aware of the foaming and put it into service ....
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<div>Have now replaced with the MT90 that shows no sign of foaming on the dip stick.</div>
<div>Wonder if others have any ideas about this weird phenomenon and is it a concern ?</div>
<div>rg</div>
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