I have a diff oil question for the DB9 (automatic). The oil discribbed on a lot of places is 75w90 LS (because of the friction plates in the lS diff). I found a website which mentions Aston Martin use shell spirax S6 AXME 75W90 and rebrands it.
Since I live in the Netherlands we have shell in every carstore and I bought 2 bottles. Now I was ready to start but I found out that it does not have any mention of having an LS additive. Looking back at the picture of the Aston bottle it hasn't got any mention of an additive either. The product sheet of shell also does not mentions anything about LS.

Now I'm confused, can I use the shell spirax, should i add any additive or should i try to find another brand 75w90LS (which has proven to be hard to find here)

 

She'll Spriax is good on its own, when it ages it does start to get clutch bind when cold. When that happens just change the fluid again and you will see why as the fluid will be nasty. AM did recommend a LS additive but cautioned on using the proper amount. Meaning less is best. Since you have easy access I would just be changing it out more often than the maintenance schedule recommends.

 

Goeiemorgen!

Perhaps it helps: attached a snap of forum-info I took a number of years ago off 6speedonline. At the time my DB9 was with me in Singapore and I needed the equivalent oil for my LSD. I was able to source Redline over there and ever since the car has driven wonderfull (20k miles since).