Lubricant stabilizers

A compound or mixture of compounds prepared by reacting under suitable addition reaction conditions sulfurized phenols or oligomers thereof having the following structure:

• ##STR4## with at least one C.sub.1 -C.sub.12 alkyl vinyl ether, whereby the final product is a compound or mixtures thereof having the structures:
• ##STR5## wherein R.sup.1 and R.sup.5 are hydrogen or alkyl groups having from 1 to about 16 carbon atoms in any isomeric structural arrangement, R.sup.1 and R.sup.5 are the same or different;
• R.sup.2, R.sup.3, and R.sup.4 and hydrogen or an alkyl group having from 1 to about 18 carbon atoms in any isomeric structural arrangement, R.sup.2, R.sup.3 and R.sup.4 are the same or different except that the total number of carbon atoms cannot be less than 4 if at least one of these substituent groups is hydrogen, R.sup.6 and R.sup.7 may be the same or different and are alkyl groups having from 1 to about 6 carbon atoms and R.sup.8 is hydrogen or alkoxyalkyl having from 1 to about 6 carbon atoms;
• n and m are 1 to 4 and are the same or different, and p is 1 to 4 or zero.