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Author Topic: Air bubbles on transmission dipstick  (Read 2663 times)
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« on: April 21, 2013, 06:47:45 PM »

I changed the gearbox/diff oil on my car today.  Filled with a GL4 80W90 upto and a smidge over (1mm) the upper limit on the dipstick.  This was with oil cold just after filling

Took car for run, everything OK but when I checked level hot I noticed quite a bit of aeration of the oil on the dipstick - level was still just a smidge over top limit.

I honestly can't recall whether I have ever checked oil level when hot so I may be worrying unduly.

Is this normal?   Concerned that I may have overfilled and that this is causing some aeration although I really can't believe that there is much more than 100 - 150 ml of oil above the 1.7 litre nominal - I had just under a third of a bottle left from 2 x 1 litre bottles added.

Advice please before I face the potential aggro of trying to remove a small quantity of oil.

!980 2.0 Coupe - Owned since 1990
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1979 1300 Coupe

« Reply #1 on: April 22, 2013, 06:55:49 AM »

This is a feature of modern gearbox oil known as 'foaming' I think. It was recently debated at length either on here or the LMC Forum (try a search). I think it ended with a recommendation of oils suitable for older gearboxes and less prone to this phenomenon. Don't think it would be due to minor overfilling. My oil level has been a little over the max level for several years.
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