With a salute to shortyb's thread - https://bobistheoilguy.com/forums/threads/bmw-hp-synth-oil-vindication.86544/ - here's what it looks like under the valve cover of my 1999 323i with 92,554 miles. It's been on BMW 5w30 with OEM filters it's entire life and has been getting it's oil changed based on what the OLM dictated.
That has given it the following OCI's:
1/8/1999 - drove it off the lot w/ 7 miles on the odometer
1/12/2000 - Oil change - 16,363 miles and 369 days
4/12/2001 - Oil change - 14,241 miles and 456 days
8/28/2002 - Oil change - 15,366 miles and 503 days
3/29/2004 - Oil change - 14,101 miles and 579 days
10/20/2005 - Oil change - 14,248 miles and 570 days
11/26/2007 - Oil change - 13,941 miles and 767 days
I pulled the valve cover to assess the need for running an Auto-RX cycle and fully expected to find things a bit gunked up. Instead, I was pleasantly surprised by how clean things are. There's a little but of staining on the vanos housing and some minor sludge on the cover nooks and crannies, but the running gear was pristine.
BTW - UOA on the oil currently in the engine is here - https://bobistheoilguy.com/forums/threads/bmw-5w30-4048-miles-1999-bmw-323i.91086/









That has given it the following OCI's:
1/8/1999 - drove it off the lot w/ 7 miles on the odometer
1/12/2000 - Oil change - 16,363 miles and 369 days
4/12/2001 - Oil change - 14,241 miles and 456 days
8/28/2002 - Oil change - 15,366 miles and 503 days
3/29/2004 - Oil change - 14,101 miles and 579 days
10/20/2005 - Oil change - 14,248 miles and 570 days
11/26/2007 - Oil change - 13,941 miles and 767 days
I pulled the valve cover to assess the need for running an Auto-RX cycle and fully expected to find things a bit gunked up. Instead, I was pleasantly surprised by how clean things are. There's a little but of staining on the vanos housing and some minor sludge on the cover nooks and crannies, but the running gear was pristine.
BTW - UOA on the oil currently in the engine is here - https://bobistheoilguy.com/forums/threads/bmw-5w30-4048-miles-1999-bmw-323i.91086/









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