Why does Honda recommend 10k OCI?

[Dad2leia]

Ray H, my daily driving schedule would meet your challenge, BUT my oil would not. I use synthetic oil, and have from mile 1500 on, have 33K+ miles on him now. I've looked through the fill hole cap and that engine is as clean as when we drove him off of the floor.

Given my mileage, though, I might be able to make a case for the most miles on a CR-V in this forum...

 

[ekpolk]

quote:

---

Originally posted by Ray H:
Sounds to me like you do a lot of distance driving at highway speeds - easy runs for any motor oil. What I'd like to hear are the results from daily drivers hauling their kids back and forth to and from school and soccer practice, taking "Fluffy" to the vet, making grocery runs, and catching the sales at the mall - those stallwart souls who put 10,000 miles or more on their motor oil in urban crawl at four to six miles per day. Show me one of those engines free of sludge at 36,000 miles on conventional motor oil* and I'll be impressed.

*Remember - Honda's not specifiying synthetic oil in their OCI specification.

---

Amazing Ray, you just described the life of my wife's Toyota Sequoia to a "T". Check out this UOA. Thirteen months, 10k miles, although the oil is GC, not a dino. Look at how much life is left there too. Sure this engine is notoriously easy on oil, but my wife's driving is definitely not, the vast bulk of it being trips of 2-5 miles tops. From the other Toyota 4.7L V-8 results I've seen, clearly Havoline would have would still be in the green in this engine at 10k miles too. By the UOA and my limited view into the engine, it's spotless clean. "Chi-chi" the sickly chihuahua has been to the neighborhood vet many times. . .

And yes, my driving pattern is easy on oil, but perhaps not as easy as you might imagine. The G35's drive train is geared so low that at 80 mph in top gear, I'm turning almost 3,000 rpms (and paying dearly for the sprightly acceleration at the pumps...). Lotsa churning going on in this engine. At least it's a very smooth runner.

 

[ekpolk]

quote:

---

Originally posted by Johnson994:
{snip}What makes you such an expert?

---

Who said I was? I look at the evidence that I can see and listen to everything and everyone I can. I keep coming back here to learn what I can about a subject I enjoy. I've done light maintenance on about a dozen cars over almost 30 years. That hardly makes me an expert, and I've never claimed to be one. I do, however, have the ability to see things with my own two eyes. Some of the things you've said just don't match what I've seen, over and over. In fairness to you, as I pointed out in an earlier post, working in NYC, you probably saw a far greater proportion of cars that had endured ultra-severe service than most of us.

Last night, driving from Pensacola to Atlanta (about 320 road miles), my 14-month-old car clicked over to 36k miles and 6,000 miles on the GC that's been in its crankcase for only a month and a half. This oil is just barely beyond the blond stage, and you can still plainly read the markings on the dipstick through the oil. Through the oil filler, you can see the top of the driver-side head and one lobe of its intake camshaft. All of it is silvery clean -- not even the beginnings of varnish. This is a perfect case illustrating why I disagree with you. Would you suggest that I need to dump this oil now because I'm sludging up??? I don't need to be an expert to make this call.

 

[Asystole]

quote:

---

why not consider 10,000+ RPM Formula race engines

---

The new 2006 F1 2.4L V8's rev over 19,000 rpm.

I would love to see an Oil analysis from Michael Shumacher's Ferarri!

 

[hominid7]

quote:

---

Originally posted by ekpolk:
The G35's drive train is geared so low that at 80 mph in top gear, I'm turning almost 3,000 rpms (and paying dearly for the sprightly acceleration at the pumps...). Lotsa churning going on in this engine. At least it's a very smooth runner.

---

In my Mazda 2.5 ltr V6 (4 speed auto) in top gear i run about 72 MPH at 3,000 RPM. I'm curious... What is the benefit for car makers to gear cars this way? Is the car more efficient at higher RPM's? I would think it hurts the hwy mpg, the best i've ever gotten out of my relativly small V6 is 30 MPG hwy, which is above the rated 28 mpg hwy. My car runs smooth as butta' but i've always been curious as to the thinking behind gearing cars to run so fast in top gear.

 

[Auto-Union]

Johnson, I suggest you wise-up and smell the coffee. It's easy to see the writing on the wall. From mfg recommendations, to extended UOA and even oil manufacturer products that go a stated 5000, 7500, even 15,000 miles. Need more? How about a pretty pic of an engine going 10k intervals after 122k.

This is your brain on Syntec:

http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=1;t=005119