Hello to all and please don't kick me, ok my 3.0d has hit 110,000 miles, it does drink oil or smoke at all (touch wood) now query i have is how religiously do we need to follow BMWs recomendation of BMWLL01 (superseded by LL04 now)

I been running mobil ESP 5/30w for yonks now, just curious if i chuck in 5/40w instead and a non BMWLL rate doil ie one that just meets the ACEA3 B3 etc rating will I be asking for trouble....?also thinking of putting on a roof rack but thats another story.....any input much appreciated

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N