Help u8glib

How do I update display..
I would like to change "over limit" to something else after 3 seconds

U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_FAST); // Dev 0, Fast I2C / TWI
void draw(void) {
// graphic commands to redraw the complete screen should be placed here
u8g.setFont(u8g_font_unifont);
u8g.setPrintPos(0, 14);
// call procedure from base class, Serial.print() - Arduino Reference
u8g.print("ECAS Axle Weights");
u8g.setPrintPos(0, 33);
u8g.print("REAR");
u8g.setPrintPos(45, 33);
u8g.print("18,232 LBS");
u8g.setPrintPos(0, 55);
u8g.print("3rd");
u8g.setPrintPos(45, 55);
u8g.print("OVER LIMIT");
delay(1000);

}

void setup(void) {
// flip screen, if required
// u8g.setRot180();
}

void loop(void) {
// picture loop
u8g.firstPage();
do {
draw();
} while( u8g.nextPage() );

// rebuild the picture after some delay
delay(500);