Copolymer useful as a pour point depressant for a lubricating oil

A random copolymer, comprising:

• from about 15 mole percent to about 67 mole percent first repeating units, each of said first repeating units having the structural formula:
• ##STR7## wherein each occurrence of R.sub.1 is independently H or methyl and each occurrence of R.sub.2 is independently selected from the group consisting of (C.sub.8 -C.sub.15) alkyl;
• from about 3 mole percent to about 40 mole percent second repeating units, each of said second repeating units having the structural formula:
• ##STR8## wherein each occurrence of R.sub.3 is independently H or methyl and each occurrence of R.sub.4 is independently selected from the group consisting of (C.sub.16 -C.sub.24) alkyl;
• and
• from greater than 30 mole percent to about 65 mole percent third repeating units, each of said third repeating units having the structural formula:
• ##STR9## wherein each occurrence of R.sub.5 is independently H or methyl and each occurrence of R.sub.6 is independently selected from the group consisting of (C.sub.1 -C.sub.4) alkyl;
• and
• said copolymer having a number average molecular weight of about 20,000 to about 80,000 and a weight average molecular weight of about 50,000 to about 200,000.