Consult your user manual.
0-40w mobil 1 synthetic European formula
The 2003 Volkswagen Jetta has a 5-speed manual.
The 2003 Volkswagen Jetta runs on regular unleaded.
unleaded
use full synthetic or you can 10w30 for winters and10w40 or 20w50 for warmer weather's
Mobil 1 full Synthetic or Dealer Kendall Full Synthetic
SAE 5w40 full synthetic.
5w30, it can be synthetic, conventional, or a blend.
10w30 a synthetic oil works, just not quaker state or mobile one.
75w140 synthetic with limited slip additive.
Synthetic oil.....5W30 Mobil1 or valvoline
Premium gas is better!