I use a quart about every 700 miles. I get the oil changed as per the oil service life indicator on the dash. But I bought a case of synthetic oil from BJs because I was topping off so often and that case was done in about 9 months...

__________________
In living life, the balance of responsible effort and dependence upon divine enablement must be maintained vigilantly.

2001 X5 3.0 manual with factory widebody kit