E36 323I - 5W-30 or 10W-40

[seismic22]

As per the title,

Whats best? Shes done 106,000. Oil looks a little black and sounds very slightly tappety.

Cheers

[Nigel Worc's]

What does your handbook say ?

Mine can have different grades depending upon temperature, 10/40 or 5/40.

I choose 10/40, but my neighbours only advises him to use 5/40.