My manual states engine oil should be "A3/B3" spec. Does that mean it's not a good idea to use "A3/B4" spec oil? Some oils are listed as "A3/B3/B4", but the one I'm asking about is listed only as "A3/B4".
From a little digging it seems that B4 is backward-compatible with B3, but does anyone know for certain?
From a little digging it seems that B4 is backward-compatible with B3, but does anyone know for certain?