There really is no need to waste your money. Lubromoly is an excellent oil, but I do not think the extra cost is warranted. I have a 95 525ia with 214k kms on the clock and I use M1 5w30 synthetic. I changed over from regular oil at 90k kms. No problems whatsoever and she still runs silky smooth. Like you I change my oil every 5k or 3 months, whichever comes first.
Brian