Yeah the car had a leaking pcv system when it was with the previous owner.it's likely a weaker or worse supportede filter media then.
On another note, I don't like that soot you have in the filter, it shouldn't be clumped together like that
What conventional oil carried the required approval for his engine?Around 1977, one of my neighbors who was into doing his own maintenance on his vehicles had a pair of BMWs and started using Mobil 1 with it's 15,000 mile oil change interval. However, since he was used to changing his oil filter on nearly a monthly basis, he decided to keep changing the oil filter as he had been and adding fresh Mobil 1 to keep the oil level where it was supposed to be.
He kept this up for about 1 year before going back conventional oil. He told me it was because he was having to add an additional quart of Mobil 1 every 1000 miles due to oil consumption by the engine which according to the BMW dealership was normal for the engines in his BMWs. So he went back to an oil change interval based on the number of engine starts that some mechanic at a seminar he went to professed was the key to long engine life. He even had a clicker counter in each vehicle he owned to keep track of the number of engine starts.
For a BMW in 1977, did they even have special BMW approval back then?What conventional oil carried the required approval for his engine?
No I was wrong about that, sorry I missed the whole "1977" part. I doubt BMW even sold Special Oils then.For a BMW in 1977, did they even have special BMW approval back then?
ACEA didn’t even come into existence until 1991. Before that it was CCMC which came out in late ‘72, but BMW wasn’t part of it at the beginning. In 1977 it would have been API SD, with SE coming out in ‘79.
This was recently posted by Overkill, it must be from about the late 90’s. It shows both LL and regular oil grades, I suspect the 70’s would have been even simpler.
If the oil filter is screwed on at the bottom, all the oil drains out anyway
Correct. When I dropped my pan on my car there was a good amount that came pouring out. Can't drain all of it unless you use a mitvac I guess but I'm not that picky.That has never been my experience. The only oil that comes out is the oil that's located in that specific area above the oil filter, it's never more than a quart (more like 1/2 that) The majority of the oil will always remain in the oil pan.
I don't understand the flexibility part. How does an oem filter give you flexibility?I’ve given up on extended OCI.
I use a quality synthetic and an OEM filter for flexibility. The factory OCI is 5k and the synthetic gives me plenty of flexibility on either side of that to account for the “life happens” side of things. I never feel pressured to change the oil and can pick the most convenient time for ME. Life is busy.