10K Mile Oil Change Interval? - Page 4 - Infiniti Q50 Forum
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post #31 of 37 (permalink) Old 04-06-2018, 08:33 PM
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Car is at 29k miles. Just looked at the dip stick, it's full. No oil burning after 9k miles.
Yes...while I've never had an oil analysis done, I changed my oil for the first time after 10k miles. My mechanic said I could have easily driven another 5k miles.

As I've posted before, I live in AZ and drive extremely hard (always sport+) in some of the harshest conditions in the country.

I also don't believe in break ins and didn't break this car in. I drove it hard from the get go. Getting my second oil change Tuesday (I have 19k miles on the car now) and will do an analysis for you guys and share the results.

If anyone has a recommendation for oil analysis let me know and I'll use them as long as it's not crazy expensive
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post #32 of 37 (permalink) Old 04-07-2018, 01:00 AM
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I went to school with MANY engineers... In the physics department we shared quite a few classes with them. I'd trust the majority of them with designing things, because they are pretty good at it. Morons are bound to get their degree and build crappy stuff, but they'll probably get put on less important projects, like... Let's say... Trunk struts.

However, it's the physicists, chemists, and lab engineers who determine oil life recommendations based on mean baseline conditions in controlled laboratories, some even more qualified than Nissan master mechanics, or even "Old Joe," (the guy Grandpa used to take his Buicks to, back when he drove Buicks).

But, really, these numbers don't come out of thin air. They're based on research and design, testing, duplication, statistical analysis, thermodynamics, and I'd be willing to bet there's an effin inverse square law in there somewhere (there always is).

If you're changing your oil every 3-5k, then you're indeed simply throwing away money. But if it gives you piece of mind, then, meh, who is anyone to tell you what to spend your hard earned dollars on? From an environmental standpoint, it's probably bad. But China is way worse, so, "no worries mate!"

Here's a decent journal, worth a look, if you're at all interested in the science behind your hobby... Gives insight into testing procedures of motor oil.

http://www.dtic.mil/docs/citations/ADA419428

Here's a more layman document explaining some of the ideas y'all are hollering about.

https://www.edmunds.com/car-news/tip...-your-oil.html

Yep... I actually said that.

Last edited by Scary; 04-07-2018 at 01:04 AM.
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post #33 of 37 (permalink) Old 04-07-2018, 05:12 PM
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If anyone has a recommendation for oil analysis let me know and I'll use them as long as it's not crazy expensive
Blackstone Labs:

https://www.blackstone-labs.com/

Send them a request for free sample containers. A recent change - postage is applied to the sample bottle, so the analysis price now includes shipment of the sample to them. Turn-around time is 7-10 business days after receipt of the sample.
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post #34 of 37 (permalink) Old 05-22-2018, 04:36 PM
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I just got an email from South Motors Infiniti in Miami saying my car is due for 5000 mile oil change??

I thought it was every year or 10K miles?? I only have 4000 miles on my car.
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post #35 of 37 (permalink) Old 05-22-2018, 04:39 PM Thread Starter
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I just got an email from South Motors Infiniti in Miami saying my car is due for 5000 mile oil change??

I thought it was every year or 10K miles?? I only have 4000 miles on my car.

Says that is for tire rotation, which may be true. Doesn't mention oil.
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post #36 of 37 (permalink) Old 05-22-2018, 04:43 PM
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Says that is for tire rotation, which may be true. Doesn't mention oil.
DOH!! lol my bad, I switched out the RFT for Pilot Sports 4S. So no need.

Thanks!!

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post #37 of 37 (permalink) Old 05-22-2018, 04:56 PM
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3 k mile oil change is total BS! Break in your car the right way... Then change the oil and filter.

See Lycoming (they build aircraft motors), Cummins, (both have oil fed turbos running more boost then our 3.0T's do), or any race motor builder's break in.

If you use full synthetic you are good for at least 7 K. Some truckers do oil analysis and many go 20+K (with oil filter changes more often) ... Just change filters at 7K in your Q50 and all will be fine.

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