Will this work on the front diff 2011 c300 4matic?

Yes, this will be compatible.

Is this compatible with my 2013 BMW 650i F13? And does it require any additives?

Yes, please refer to the fitment guide. It does not require additives.

Will this work on a 2011 535i M/T RWD? And what is the capacity for a complete drain & fill? VIN# WBAFR7C53BC267051

Yes, the rear diff is just less than a liter.

I own 2010 Mercedes c300 4 matic sport, how many bottles would i need for both differentials front and rear?

2L total will be needed for both front and rear differential on your C300.

Would this work for a 2011 BMW 335is RWD. How many bottles would I need?

It would depend on the package of the car. Please contact service@fcpeuro.com with your VIN and we would be happy to confirm.

Hi there, is this correct for 2010 A5 Quattro with a manual transmission? Thank you

Send us your VIN at service@fcpeuro.com and we will be happy to confirm that for you.

is this the correct fluid for a 2011 BMW 535i vin wbafr7c55bc604156 ?

Yes, this would work for that VIN.

Will this work in a Mercedes Limited Slip Differential?

No, this is not for use in cars with an LSD.

Is this the correct oil for a 2011 BMW X5d? Production date of 4/2010. Is it for front and rear differentials? What are the capacities?

Yes, this is correct for that vehicle. The capacity is likely going to be just under a liter, but please email service@fcpeuro.com with your VIN for specifics about your vehicle.

How many Litter in total do I need for the 2013 BMW 640i GC? Any advice to change the fill plug at the same time?

It is likely about 1 liter, but please contact service@fcpeuro with your VIN to confirm. It certainly would be a good time to change the plug if you so desired.