Abstract: Organotrialkoxysilane stabilizers for inorganic silicate corrosion inhibitor additives in antifreezer/coolant formulations are described. The stabilizers have the following structure; ##STR1## wherein R is an alkyl group of 1-4 carbon atoms, R.sub.1 is either ##STR2## and R.sub.2 may be selected from ##STR3## and R.sub.3 is phenyl or ##STR4## These stabilizers help prevent the gelling of the corrosion inhibiting silicate additives in antifreezer/coolant formulations thereby increasing the useful lifetime of such formulations.

Abstract: Organotrialkoxysilane stabilizers for inorganic silicate corrosion inhibitor additives in antifreezer/coolant formulations are described. The stabilizers have the following structure: ##STR1## wherein R is an alkyl group of 1-4 carbon atoms, R.sub.1 is either ##STR2## and R.sub.2 and R.sub.3 may be same or different and selected from --Ph, --CN, ##STR3## (wherein R is an alkyl group of 1-4 carbon atoms). These stabilizers help prevent the gelation of the corrosion inhibiting silicate additives in antifreezer/coolant formulations so that the silicates could be more persistent in their corrosion inhibiting properties.

Abstract: An antifreeze composition for use in aluminum internal combustion engines is disclosed. It is comprised of from 0.05 percent to 0.5 percent silicate, from 0.07 percent to 0.35 percent nitrate, from 0.2 percent to 2.0 percent phosphate, from 0.5 percent to 4.0 percent benzoate, from 0.1 percent to 1.0 percent molybdate, from 0.02 percent to 0.3 percent vanadate, from 0.05 percent to 0.3 percent triazole, and from 100 ppm to 5000 ppm organosilane stabilizer for the silicate. Organic amines and borates are excluded in the compositions and the pH of the compositions is from about 7 to about 9.