greasy is almost always pronounced as

[gree-zee], /ˈgri zi/, with a medial

[z], /z/, in the South Midland and Southern U.S. and as

[gree-see], /ˈgri si/, with a medial

[s], /s/, in New England, New York State, and the Great Lakes Basin. Speakers of New Jersey and eastern Pennsylvania are divided, with some using

[s] /s/ and some using

[z]. /z/. Standard British English reflects both

[z] /z/ and

[s] /s/ pronunciations and British folk speech is also divided regionally, with

[z] /z/ heard in the eastern counties and

[s] /s/ in the central and western ones. Both pronunciations were brought to the colonies, where the present U.S. pattern emerged.

Did you mean greasies?