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re: OB mechanic opinions.

Posted on 4/17/18 at 9:06 am to
Posted by bapple
Capital City
Member since Oct 2010
11910 posts
Posted on 4/17/18 at 9:06 am to
I’ve actually measured mine and the life gets below 10% right around 10k miles. Maybe my software is newer than yours or maybe it actually uses engine data to calculate the oil quality. But I wrote down the mileage I reset it at 100% and then checked when it was at 10% and it was right below 10k.
Posted by Boat Motor Bandit
Member since Jun 2016
1891 posts
Posted on 4/17/18 at 9:09 am to
engine oil life monitors that show % value is strictly off of a mileage calculation that can be changed in most vehicles to reflect what mileage you like to change your oil at. There is NO oil quality monitor on vehicles.
Posted by Coppertone
LA
Member since Aug 2013
345 posts
Posted on 4/17/18 at 9:27 am to
I have a new Sierra and just changed the oil because the oil life monitor was at 4%. I was at 7600 miles. I’ll likely go 10k next time to match with my other vehicles. It’s so easy to remember to alway change the oil on an even mileage, 100k, 110k, 120k, etc.
Posted by LEASTBAY
Member since Aug 2007
14318 posts
Posted on 4/17/18 at 9:30 am to
I switched my F150 from motorcraft semi-synthetic to walmart full synthetic. Change when the computer tells me to. Follow what your manual says or youre just pissing money away.
Posted by Buster180
Member since Jun 2017
1455 posts
Posted on 4/17/18 at 9:43 am to
quote:

engine oil life monitors that show % value is strictly off of a mileage calculation



Where do you all come up with this stuff? From Ford's website:

quote:

...determines when you should change your engine oil based on how your vehicle is used. 


quote:

In practice, actual oil change intervals will depend on several different factors, but severe usage will generally require more frequent changes. Also, if it’s been more than a year since your last oil change, the IOLM will display a reminder message regardless of your mileage.
This post was edited on 4/17/18 at 9:46 am
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 4/17/18 at 10:09 am to
Oil life monitors (the GM one is the one I'm most familiar with) are very good and far more sophisticated than just mileage.
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 4/17/18 at 10:11 am to
Correct

I do this kinda shite for a living. Trust thy owners manual. Despite what everyone thinks, they're not trying to sell more oil.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 4/17/18 at 10:30 am to
I drive pretty hard, so mine recommends shorter intervals than yours. Me driving normally is probably equivalent to someone towing a trailer.

IIRC, it measures stuff like mileage, time running/idling, rpm, and oil temps to make the recommendations
Posted by Coppertone
LA
Member since Aug 2013
345 posts
Posted on 4/17/18 at 2:02 pm to
quote:

Message OB mechanic opinions. by DownshiftAndFloorIt Oil life monitors (the GM one is the one I'm most familiar with) are very good and far more sophisticated than just mileage.


It only monitors engine info. There is no oil condition sensor or anything like that.
Posted by TU Rob
Birmingham
Member since Nov 2008
12753 posts
Posted on 4/17/18 at 2:07 pm to
What I don't understand is why the reset interval on our Toyota is 5k miles when the owner's manual says 10k miles, full synthetic. Also the wonky way you have to reset it by using the odometer button and ignition. Everything else on the display I can reset by hitting a button on the dash, but not that one.
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 4/17/18 at 2:18 pm to
It isn't necessary. API standards on oil are rigid and it wears very predictably and consistently based on engine operation. Slap some margin on there and you have a system that's 2nd only to having the oil checked. When you're looking at doubling/tripling the status quo on oil change intervals even with the margin you're making a big difference. As long as you put oil meeting the specifications in the manual in your engine, you should trust the light. Putting oil that exceeds the specifications in the manual is likely wasting money unless you get some samples and trend the analysis to see how far you can stretch changes.

Not sure why Toyota is lagging so far behind on this. GM nailed it with their system in the early 2000's.
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