What ho one and all,
2015 Maz 3 BM 2.00 Skyactive. Had the car for just over one year; bought with 45k on the clock; I have done one oil change and about to do the next at 55k.
The oil I used is Castrol Magnatec 0W-20 but I cannot find it again at a reasonable price. The site I usually visit when I enter the reg, suggests round 30 different brands/types, and that gets my knickers twisted.
The manual suggests as an alternative 5W-30 but also says API -SC/SM/SN and ACEA - A3/A5. the current Magnatec has the required Ford spec number but the API and ACEA are different.
So what is the importance of the correct ACEA and API? If I use a good quality 0W-20 or 5W-30 that has different ACEA and API, what is likely to happen?

Thanks and toodle pip.

PS. I live in the UK so not exactly adverse driving conditions at any time of the year.