l330if83 said:naw, I've been changing the oil every 10,000. I'm gonna start changing the oil earlier though, thanks.
KevinJ_2k1_325ci said:Synthetic oil does not breakdown but the oil additives do burn off which also includes binding agents. By 5k miles depending on whether highway or city driving, you should have burned these additives off.
I'm changing my oil in-between service intervals and is also suggested in the owners manual. You should also change the filter EVERY TIME. It is the filter that BMW stated in a bulletin that lasts 15k miles.
Also 5W30 is rated to 90 degree temps! I also heard BMW changed the BMW synthetic from 5W30 to 5W40. The oil for above 90 degrees is I believe 15W40 which nobody makes. You can go to mobil 1's website and put your car in and it will tell you the oil ranges for your car. Some of the oils Mobil doesn't even sell. Personally I just ordered Mobil 1 0W40 (European formula) which is a premium oil through any oil manufacturer and through my research I think the best to use in the widest temperature range and with additional binding agents that regular oil doesn't have. It is also rated for use in BMW. The 0W40 oil is also hard to find and now standard in new Mercedes and Porsche. I bought online through a Mercedes parts and accessories dealer onsale for $4.95 per bottle! versus over $6.00 per bottle which I couldn't find any in my area anyway. They charged $4.50 shipping. Do a search on my name on 0w40 to see my original post with the web site.
i do mine every 5000 miles. check it out.. http://john.northsyde.com/galleries/oilchange/oilchange.html330if83 said:When do you guys change your oil? The BMW dealership says I should change my SYNTHETIC oil every 15,000 miles.