ASTM Table 53 / 54

Hi,

We are using Base Oil as our product. Can anyone suggest which table shall I use for conversion.

Or else can someone suggest what are the basic difference between ASTM Table 53 / 54 A,B,C,D apart from which type of product these are being used for. I mean more mathematically, what is that these tables do different from each other.

Also is there a download link to any ASTM 53 54 table available with you.

Thanks,

Anubhav