Most new engines (NA or turbo) require low-viscosity fully synthetic engine oils. It is common for manufacturers to suggest in the manual to use 5w30 API SN or 5w40 API SN in case 5w30 is not available. Some other manufacturers, like Honda, have started using 0w20. For Ecoboost engines, Ford is recommending 5w20 though 5w30 can be used as an alternative.




why can't we just use some off-the-shelf API SJ/SM/whatever
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