Or, more likely, those boutique oils really aren't any better than the
oils from the big companies, or they don't meet all the specifications.
Shell Rotella synthetic at WalMart. Half the price of Mobil 1 (about)
and meets all the Audi turbo specs.
Another reason could be that the Audi list which the OP was referring to was
only listing some (and not all) oils, mainly those that are easily
obtainable at most major auto parts stores rather than through mail order.
As for Amsoil, they claim that their 5w-40 European Car Formula surpasses VW
502.00, 505.00, 505.01 specs and many others. But then again, the wording
is such, that it doesn't clearly state whether it actually MEETS them.
Amsoil makes good oil, despite their sometimes questionable marketing
tactics, and I know this 5w-40 would do just fine in most VAG engines, but
if it's not on the Audi list and your warranty is at stake, you'd better
This particular vehicle is already out
of warranty, so that is not an issue.
For the other two Audis we have that
are still under warranty we use Castrol
Syntec 10-40 in summer and Valvoline
SynPower 5W-40 in winter. Both are on
There is quite a bit of empirical and
anecdotal evidence that suggests Mobil
One is inferior to both.
As someone else states it is perhaps because they haven't paid to pass
the test, or it could be because they wouldn't pass the test. Having
read the claims, and the dismisals against products such as Slick 50,
Motor Up  etc I have now become a lot more cautious about which
products I chose to pour into my engines.
I'm not sure about in the US but I know in the UK my local VW dealership
will sell me the VW approved oil, for less than the local motor factors
will a main brand. I can run VW Fully Synthetic  for about half the
price of Mobil 1, or bog standard VW Mineral for less than the price of
Catrol GTX, Duckhams etc.
Ever since I made this discovery down at my local dealership, I've
bought all my oil there.
 And suffered an engine failure which having since read those claims
I suspect Slick 50 was the reason for...
 Or Synta whatever it is branded.
I think you're thinking of Quantum Synta Gold, for the fully sythetic
one. Synta is a semi-synthetic (in a silver pack) GSF sell the quantum
range as well: I've just spent a lot of time trying to find a stockist
of Millers oils locally, and given up. I went to GSF and got the Synta
and Synta Gold. You're right: it's an absolute bargain. Obviously it
meets all the VW standards, and it's much cheaper than other brands.
Yes, and as there are only about five  manufacturers of oil, you know
the Quantum oil is just somebody elses rebranded , or a slightly
different blend with less additives.
I have been told in the past the Gold is just Mobil 1 though, not sure
how much truth there was to that though.
 Or was it three, theres only a handful of brake disc manufacturers
too, and I can never remember which way round the figures are now.
 Halford cheapo mineral oil is Duckhams for eg.
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