OLED and SD card

Does any one expirienced issues with using the <SD.h> library and <GOFi2cOLED.h> in one code? if I use them separately it works fine but when I put them in one code its just not working (no error messages)

#include <GOFi2cOLED.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <SD.h> 


#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

File myFile;
GOFi2cOLED oled;


 
void setup(void)
{
  Serial.begin(9600);  
  
  Serial.print("Initializing SD card...");

   pinMode(10, OUTPUT);
   
  if (!SD.begin(4)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  Serial.println("Dallas Temperature IC Control Library Demo");

  sensors.begin();
  
 // oled.init(0x3C);  //initialze  OLED display
  
 // oled.setTextSize(1);
 // oled.setTextColor(WHITE);
 // oled.setCursor(0,0);
 // oled.clearDisplay();
 // oled.display();
}
 
 
void loop(void)
{
  sensors.requestTemperatures();
  myFile = SD.open("test.txt", FILE_WRITE);
  
  if (myFile) {
    Serial.print("Writing to test.txt...");

    myFile.print(sensors.getTempCByIndex(0));
    myFile.print(",");
    myFile.print(sensors.getTempCByIndex(1));
    myFile.println("");
    myFile.close();
    Serial.println("done.");
  } else {
    Serial.println("error opening test.txt");
  }
  
  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");
    
    while (myFile.available()) {
    	Serial.write(myFile.read());
    }
    myFile.close();
  } else {
    Serial.println("error opening test.txt");
  }
  delay(5000);
}

//void header(){
//    oled.setCursor(0,0);
//    oled.println("Teplomer");
//    oled.println("--------------------");
//    oled.setCursor(0,16);
//
}

but when I put them in one code its just not working

Just how much memory are you using? All those string literals are taking up space, unnecessarily, in SRAM. Stop that:
Serial.print(F("Initializing SD card..."));

http://playground.arduino.cc/Code/AvailableMemory