I've been running the AMSOIL 5w40 in my cars exclusively for the last 5+ years and it has lasted well and held up to abuse as well.
I change every 5K with Liquimoli 5w-40... I'd use 5w-40 over 5w-30, especially if you're doing any kind of upgrade to performance. Car will run a heck of a lot better.. 5w-30 is to thin when working an engine as hard as most of us do.
For those of you having a hard time finding VW spec. oils and you desperately want to stick to the 5w-40, try your local lawn mower, or small engine repair shop. In my area only they stock the 5w-40 synth. VW 502.00 oil - they used to get Elf/Total, but recently moved to Amsoil.
I've been running 12k-20k, oil & filter change intervals with Amsoil since 1978 (mainly in VW/Audi engines) and have never come close to wearing out an engine. When I sold my 1990 Audi 100 with 260k miles, it was still only using a quart of oil in 10,000 miles.
For my 2.5 engine, with +100k miles and a turbo, ive been using liqui moly with great success. It meets the 502 requirements, and it yields great results.
VW uses Castrol Edge 5w-40, it's what they used for mine too, i do like Castrol but not the one made here in UAE(Sharjah), therefore on my RS6 i am using Liqui-Moly Top Tec 4100(VW approved 502, 505, 505.01) which is only made in Germany and i very happy with it, therefore i am going to use it for the Phaeton as well!
I've been told the magic elixir for the VR is 20w50 Amsoil Not sure I can verify that just yet but my VR is a bit quieter with it since I added it
I used Amsoil 0W-30 Severe service oil in my Jetta 1.8T for the first 120k miles or so. No problems, mostly 5-7k oil changes except when I was commuting from Ct to Boston.
i know out of my positive personal experience with this oil and then every Blackstone oil analysis indicates low wear. i am a very satisfied customer which will only run liqui moly fluids on all my motors.
I agree with nickbeezy... Liqui moly is qualit oil... Its funny, the way i see it: it delivers better quality than expected... If you use the oil in addition to some of their additives you will notice impressive results. These results include a quieter engine, better mpg, better long term reliability, less oil burned, etc.
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