The whole story was explained in my initial post
Hmm well I purchased a heap of the A3/B4 oil (30L) and had two left at the time of acquiring my passat. I wouldn't say it was dishonest as I didn't have the receipt since it was purchased ages ago and merely wanted to exchange it which SCA gladly obliged to
Hmm never can be sure, its the same at dealerships though!
The invoice had castrol professional 1L x 5 and was invoiced at something like $25-30 per L (which as you would know the professional product comes only in 1L) so I'm as confident as one can be, based purely on an invoice...
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