You need to get a full understanding of where 502.00 & 504.00 sit in relation to the fixed & variable service regimes.
As I've said before, 502.00 is perfectly legitimate & safe to use on fixed service regimes where no severe service factors are present. In the UK, people actually complain if they are on fixed & the dealer uses 504.00 as it is deemed over-specced for that service regime.
Yes, about the cheapest you'll get 504.00 is $60-$65. 502.00 can be had much cheaper - even as an APPROVED oil.
Castrol Edge Sport 5w-30 with 502.00 approval is a great alternative, especially if your engine likes a drink.
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