Yes that is true...Holden will send an offer in the mail, but from memory I think it may not work out as cheap, comparatively speaking year by year & not sure you eventually can total 6yrs??
Ie overall I don't think it is quite as good all round...I'm pretty sure I've kept that paperwork in the past so I will try & dig it out.
Found what I was looking for - a single A4 sheet with the finance managers business card stapled to the corner; so it was in the paperwork folder they gave us when we bought the SV6 ute mid last year. It's the 'Holden Extended Factory Warranty' and has a 'Warranty Period' table on it that applies to all Holden/HSV vehicles.
The finance manager never spoke to me about it but highlighted in the table is
"12months/150 000kms = $1745 if vehicle is <12mths&15 000kms" and "$1910 if >12mths&15000kms"
(The table offers up to 36mths/175 000kms = $2555 or $2865 relative to the above figures but these longer periods were obviously not being offered to me)
I assume she only highlighted the 12mths for me because I already was getting the freebie 5yr wtty as a special offer with the vehicle. It seems you won't get a factory wtty from Holden for longer than 6 yrs evidenced by when I tried to extend the roadside assistance on my VE at 6yrs a few years back & Holden said they wouldn't - had to go with RACQ but was similar money.
Anyway these figures are all higher than the $2060 you pay for the 6yr/100000km if you select that first up as part of the sale - so do it before not after you buy the car to save some coin.