Belly pan comes off, which requires the removal of 6 13mm bolts.
The filter cap can be accessed from up top, and will either be a 32mm or occasionally 36mm socket. You'll need a couple of long extensions, and possibly a uni-joint to get the right angle of attack. There's a intercooler hose that runs near where you feed the socket and extensions down the front of the motor. Un-couple this to improve access to it. Lube the o-ring up on the intercooler hose before re-installing.
Also, replace the sump plug. If you re-use it, it'll leak, and you'll strip the thread in the sump over-tightening it so that it doesn't.
'07 Transporter 1.9 TDI
'01 Beetle 2.0
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