Whats the longest safe OCI seen?

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Over two years on my ex girlfriends van.
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OCIs based on UOAs is the only way to determine what a "longest safe OCI". every engine/environment/driver is different and UOA is the only real way of knowing what your oil is doing.
 
Hard to say without a bunch of UOA's, but my dad used to have a BMW 740iL, the dealer swore it would be fine to only change the oil when the service light came on. This was about every 15,000 miles on average. Dad kept the car until almost 100,000 miles, during that time we never had to add any oil and it never used any, still ran like a top.
(Everything else broke, but I digress...) BMW required synthetic and it held 12 quarts as I recall.
 
24K miles on a car in 10 months.
Just another proof that the long trip freeway driving cycle is very easy on oil.
 
I was commuting 40 miles one way to work that's 80 x 7 = 560 x 52 = 29,120. This was on my 86 Nissan but that is a different story.

[ December 18, 2005, 08:44 PM: Message edited by: Gary Mintz ]
 
I knew a guy in Ohio that had a Chevy truck and put 100,000 miles on it without changing oil except the factory fill (one OCI). I don't know what oil he used but he only topped-off. He did change the filter a few times however. Truck ran great with never a problem when he sold it.
 
It's a bit different if you do short stop-and-go city trips and have a 1.8T engine.

I would love to see someone with a sludged/coked 1.8T after a 50k mi = 80k km OCI with SynLube try to get VWoA to honor either the powertrain warranty or the 8-year "sludge" warranty. "But SynLube told me I could go to 150k mi."
 
SynLube looks to be the biggest rip off in the oil industry. I like this paticular quote from their site, "Additionally many "pure" synthetics are very poor lubricants and cause excessive wear." You have got to be kidding me. There is no way I would run an oil for 150k miles. I'm suprised the FTC isn't looking in to this.
 
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