Which oil / what do these codes mean - A1 or A3/4?
Discussion
Asda seem to have some great prices on oil at the moment so I popped in to pick up some Castol Magnatec 5W30 yesterday but noticed there were 2 different tyres A1 or A3/4. Which one is the ideal choice for my WRX? Will be having an oil change in a month or so but at the moment, it has 5W30 in it and could do with a top up.
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