[Healeys] Oil Change in differential

[Bob Spidell]

The shop manual recommends every 500 miles, but you have to remove the 
engine first (/JK--sorta).

Good question, though. Modern cars--well, 'modern' since about 1980--can 
supposedly go indefinitely without a diff fluid change (most have no 
drain so it's somewhat inconvenient to do so anyway). I think, with 
full-syn oil you could go 100K miles or more, even in a Healey. But, the 
rear axle housing has a vent and, theoretically, water could get in and 
if you try to ford the Mississippi you might want to check for 
'milkshake' (really, I just wanted to see if I remembered how to spell 
'Mississippi').  Realistically, a lot of us have rear hub seal/bearing 
and other issues that require a drain anyway, and trying to re-use oil 
is a pain so why not install fresh when this happens. If it's been a 
long time--or never--since you've changed it why not do it for peace of 
mind--and why check for crud or metal, and replace with a full-syn 
oil?--then never worry about it again (unless, of course, ...)

Bob

On 8/1/2020 7:54 AM, Ron Fine wrote:
> With plenty of time on my hands I am finally getting to the oil change 
> type of chores on my BN7.
> With the car up on blocks I can get to the things that need grease and 
> was wondering if there a “rule of thumb” for when or if to change the 
> oil in the differential?
> Thanks for any suggestions.
> Ron Fine
> 61 BN7
>

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