I know you said low miles but it really depends on the usage. You're using a name brand synthetic so I'd say you can go 6 months beyond 1 year "IF" the vehicle has seen full operating temps on a regular basis, i.e., it's not a short-tripper. I've done this several times on personal vehicles running synthetic, without issue. But if it is a short-tripper and does not get everything nice and hot regularly, do not go much further than 1 year. The phrase "pennywise and pound foolish" comes to mind.