From what I can find, Castrol makes a 0W30 longlife oil which can be used in VW engines which have sensors which support the longlife service regime. According to this regime, oil change intervals can range from 9,000 miles or 12 months to as long as 30,000 miles or 24 months - IF the sensors will allow such an extended interval.
In the early years only VW dealers carry Castrol Syntec 5w-40 oil which is where I am always getting from.
Valvoline Synpower 5W-40 also meets Volkswagen specifications.
On the 16v I had I also had a cyl head temp gauge and temps dropped from 240F to about 210F when I switched from Mobil 1 to AMS, so did my oil temp drop fromt eh 250 to 215 range.
Using Redline racing 50W in a SCCA 1.6L production engine with an oil temp of about 210 to 215 degree (F) on a hot southeastern race weekend. Hot oil pressure is about 70 to 75 psi at WOT and about 30 psi after a session in the paddock prior to shut down.
I switched to amsoil 20w50 and the temps are down to 230ish
With the AMS and a 20 row cooler my temps stick at 190-200 dependant on ambient temps thus far.
For the past 5 seasons, I've been running 5w-30 Mobil 1 but recently switched to Red Line 30 Wt with no ill effects. Typical oil temps (racing on in the Mid-Atlantic area with temperatures and humidity in the 90s) are 250ish with 30-45 PSI hot oil pressure at full chat.
when i had my 2000 Jetta TDI I used Shell Rottela T full synthetic. 5-40 i think. blue bottle you can get at your local mega-lo mart good stuff and cheap check there web site.
i use mobil delvac 1 5w40 synthetic oil in my 2000 beetle tdi.
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