hi i have a mk4 1.8 sri astra and am wondering what the differance is between the engine codes x18xe1 and the z18xe are. i think my engine code is the z18xe and am wondering if A) i can use the different engine code in my car and if there is any difference performance wise. the car has been making a tapping noise after it an out of oil, i put new oil in and the tapping has got quieter but is still tapping none the less.
my astra is on a 51 plate registered 02
any help or info would be great as i need this sorting asap