What grade of synthetic oil does my 2003 vw new beetle take

for VW's , 80w90 synthetic, and I stress synthetic. These G/Bs have full synthetic gear oil already, so you can only use synthetic due to the way it works, but the highest grade is 80w90 known as GL-5 synthetic

On a 1.8T you should ALWAYS be running synthetic, otherwise you are going to have sludge issues...especially if you do a lot of city driving. Mobil 1 0w-40 is a great oil, readily available and reasonably priced.

Hope this helps...

Do you have the turbo model? If so you could have a bad turbo. You may also have bad valve seals or piston rings. If you have a turbo you can remove the hose or pipe off of the outlet side of your turbo between the turbo and the intake manifold. If there is oil in it your turbo is leaking and will need repaired.

VW. use 10/40 semi synthetic.

The proper weight for your oil should be written on the oil fill cap located under your hood. It's like a 20 weight oil.

5W30, or 10W30 semi synthetic. Unless you use a long life oil, then its 0W30 full synthetic with VAG spec. 503.00
If only topping up, then use a 5 or 10W30 semi synrthetic
Hope this helps

Sounds like an isolated problem. While it's true that VW Beetles use a lot of oil, it sounds like you are loosing an abnormally high amount if your having to add oil every month. If it's not leaking out it has to be burning out through the engine. A good indicator of loosing too much oil through the engine is a white smoke coming from your exhaust.

Also, be certain your using the SAE 5W-30 oil that's recommended by VW.

Change it every 10k miles. You have to use 5W40 FULL SYNTHETIC oil. Not just any oil! You can buy Shell Rotella T 5w40 or Mobil1 5w40 Turbo Diesel Truck oil at Walmart. Both of these oils meet VW's TDI oil requirements.

any good quality 10w 30 oil will work just fine. If you want to go with synthetics, i've done tons of research on them and personally prefer to use them. To make your decision, the best test results are found by "googling" noac volitility tests. You will find a valid comparison of synthetics there. All products tested far exceed any comparison to "normal" oil!

5w-30 is the correct weight of oil for your vehicle. If you are currently using synthetic oil then you must stay with synthetic. If you are using regular conventional oil, then you can choose to stay with it or switch to synthetic oil. Good luck