09-01-2015, 06:00 PM
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Member
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Join Date: Jun 2014
Location: SA, TX
Posts: 6,473
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Quote:
Originally Posted by trader4
So, what data, evidence, etc do the car gurus have to back up their
recommendations?
I've yet to see any engine failure that could be attributed to oil
change issues when it was done at ~5K with conventional and
~10K with synthetic. The car gurus could just have personal
opinions and like some here do it based on belief, that it makes
them feel good, etc.
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I've got anecdotal evidence... seen really bad sludge on a couple of Porsche Cayenne Turbos with 10,000 mile intervals. Gunked up lots of passages and they ran pretty badly even after flushing them a couple times. The owners ended up getting rid of them after a few flushes and they ran "okay."
I know anecdotal evidence isn't great, but... I saw those engines with my eyes which went a long ways to reaffirm my 5k-7500 mile interval. 
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)
2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)
2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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