Oil change intervals on new vehicles - Page 4 - Fuelly Forums

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Old 03-15-2017, 12:48 PM   #31
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Oil filters are dead end filters that will eventually clog. The efficiency quoted on their carton is for a single pass through, because they have already started the clogging process.

The 'suspended contaminants' mentioned in another post are from the wear and tear oil goes through in the high stress environment of an engine. Outside sources, like sulfur content of the fuel, also play part. Their growing presence in the oil is why it turns darker shades.

My car had a cartridge filter that was easily changed from the top. No messing with jacks, crawling on the ground, or blind reaching to swap it out. So I swapped it out before actually changing the oil to see if it had any visual impact on the old oil.

Since it lighten the oil's color, that tells me the darkening was mostly due to those suspended particles, that they aren't simply too small for the filter, and that the old filter had the bypass valve open at some point prior to the oil change interval.

As to these contaminants settling out and blocking things, I no concern for that happening. There is the flow rate and pressure of the oil pump to keep things moving, and the oil itself contains detergents. Not only do they keep the particles in suspension, but they also keep those particles from clumping together to form sludge.

The real threat these particles pose is that they form acids when mixed with water, and it doesn't matter if they are trapped in the filter or not. But along with the detergents, the additive package in the oil also includes compounds to neutralize acid that forms.

As too early oil change on a new car, it is just a placebo. Modern manufacturing means the parts fit better when assembled than it was in the past, and the engine gets run as part of the QA process. If the manual doesn't call for an early oil change, then the car doesn't need it.
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Old 12-04-2017, 11:07 AM   #32
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Digging up an old topic - but just wanted to brag that I passed 300k miles on my engine last month, doing oil changes at 5k and filter changes at 10k. (YMMV!)

Engine still runs great - no indication of any eminent failure. (Transmission... kinda on its last legs.)

Nowadays I tend to run 10W30/40, depending on time of year & temperature, instead of the factory recommended 5W30.

-BC
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Old 12-04-2017, 12:37 PM   #33
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I did just the opposite with my van. It called for oil and filter at 5k miles. I used synthetic oil and changed the filter at 5k with the addition of 1 quart to replace what was lost with the filter. Oil changes at 10k. Saved a ton of money compared to straight 5k intervals and it was still perfect at 187k when I retired and sold it.
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Old 12-05-2017, 02:09 AM   #34
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600,000 on my friends van, 25,000 miles between oil changes
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Old 12-05-2017, 04:23 AM   #35
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Quote:
Originally Posted by Draigflag View Post
600,000 on my friends van, 25,000 miles between oil changes
I had a '68 Sportwagon once, 780k miles. But it was on its 2nd transmission and 3rd engine at the time...

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Old 12-05-2017, 08:02 AM   #36
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Very few cars get sent to the scrap yard because of an issue arising from a lack of oil changes. I suspect many that do go that way still run, and they are just worth more for parts and scrap than the effort to keep on the road.

The US is switching to ultra low sulfur gas, unless Trump cancelled it. Manufacturers should increase the length oil life when the roll out is complete.
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