[Zumata - Zumata]

Great write-up. Thanks!
To clarify the diff fluid requirements, my understanding is that only the Abarth requires the LS additive while the Classica & Lusso use regular 75w-90 gear oil.

 

[Zumata - Zumata]

Are the replacement washers the same dimensions as the ones that go on the manual transmission fill and drain bolts? I still have a few of those kicking around.

Per this tutorial, the diff & trans crush washers are the same for a M18 bolt.
http://revlimiter.net/blog/2017/02/nc-mx-5-miata-2006-2015-oil-trans-diff-fluid-change/

I found some M18 washers on eBay for a few bucks. https://www.ebay.com/itm/M18-18mm-C...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

 

[Zumata - Zumata]

Hi Guys . Just drained my Diff . I got about 400 ml. ( should be 600 ml ) sorry dont know what that is in US quarts. Now I have refilled with 600 ml... *6 litre as per book. It has not filled to the top hole . Question .As per book or to the hole ?
S-Design just a Lusso with Abarth trim . Think it was only sold here in UK but may be wrong. But no different to any 124 underneath .
Side note ...gearbox was full to top .
Thanks
Pete D

I don’t know the right answer to this, but I noticed the same thing when I changed mine. I opted to fill it until the oil came out of the diff fill hole.