Puzzled by oil life monitor. - Ford F150 Diesel Forum
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post #1 of 16 (permalink) Old 05-10-2019, 09:40 PM Thread Starter
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Puzzled by oil life monitor.

Hi everyone,

I am making this post for my puzzled brother in law who is the owner of a 2018 3.0L V6 Diesel. The first oil change was done at 5000km/3100miles, now after another 3500km/2200miles, it has only 5% life in oil left as far as the this oil life monitor is concerned. He did notice the rapid decrease all along and it was left at the dealer for 4 hours for diagnosis, however they could not give an answer. Instead they asked him to wait till next oil change and see how it goes, which is not super helpful...

Hoping there's anyone here who might happen to have experience with this or perhaps some insight? Thank a lot for your input in advance.
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post #2 of 16 (permalink) Old 05-10-2019, 10:24 PM
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Oil life monitor is a computer algorithm joke! With the EGR system on this truck just change the oil every 7000 km. Then just enjoy how awesome this truck is.
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post #3 of 16 (permalink) Old 05-10-2019, 11:17 PM Thread Starter
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By the ay, all these miles were done in mild condition, no towing, no heavy duty and pretty much never hard on throttle; perfect weather as well. About 30% highway and 70% city.
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post #4 of 16 (permalink) Old 05-10-2019, 11:22 PM Thread Starter
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Originally Posted by RBaker View Post
Oil life monitor is a computer algorithm joke! With the EGR system on this truck just change the oil every 7000 km. Then just enjoy how awesome this truck is.
Being a car guy myself, that's exactly what I told my brother-in-law. The thing is this is a brand new vehicle that he paid hard earned money for, if there's something faulty, it needs to be at least taken care of.
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post #5 of 16 (permalink) Old 05-10-2019, 11:23 PM
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Originally Posted by Neil Wang View Post
By the ay, all these miles were done in mild condition, no towing, no heavy duty and pretty much never hard on throttle; perfect weather as well. About 30% highway and 70% city.

70% city is the problem. Check oil level, make sure its OK. If so, do it as manual states, personally I would do it 5k to 7k miles. Use a good oil like Rotella T6.
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post #6 of 16 (permalink) Old 05-10-2019, 11:24 PM
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Originally Posted by Neil Wang View Post
Being a car guy myself, that's exactly what I told my brother-in-law. The thing is this is a brand new vehicle that he paid hard earned money for, if there's something faulty, it needs to be at least taken care of.
Computer will also adjust over time. Drive it more. Check it manually, and you should be good to go.

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post #7 of 16 (permalink) Old 05-11-2019, 01:26 AM
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Diesels are made for highway driving honestly many of the benefits for them are not realized unless driven many many miles. Which is whybtyp9val diesels have 200 to 300 thousand miles
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post #8 of 16 (permalink) Old 05-11-2019, 01:42 AM
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Ehh I wouldn’t say that the city miles is the problem I’m primarily city in mine as well and I have 4,300 miles and my oil monitor is 40% so seems weird his going down thaaat quickly. I am definitely switching to Rotella T6 for my first Change and not looking back though I would have him try that good proven diesel oil then see what happens after that with the monitoring system. I ran Rotella T6 on both of my past duramaxes and in my gasoline boat and it is outstanding oil.

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post #9 of 16 (permalink) Old 05-11-2019, 01:44 AM
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Do agree with everyone though about screw the oil monitor though lol it has no way of truly knowing. Other suggestion would be take an oil sample when it gets down to 10% or so and have it analyzed to see if maybe the oil monitoring system is just completely jacked on his truck? Good luck man!

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post #10 of 16 (permalink) Old 05-11-2019, 07:46 AM
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Well, my truck is behaving properly when it comes to oil change intervals.

My first oil change was at 8,172 miles, and when I did that change I was tracking to 0% oil life remaining at 10,xxx miles. This first oil change I did with Rotella T6 5W-40 since 5W-40 is what is recommended when running biodiesel that the fuel stations in Minnesota are mandated to sell us 5-20% biodiesel.

I have 1,721 miles since putting in Rotella T6, currently have 82% oil life remaining, so at this moment I am tracking to 9,561 miles before 0% on this oil change. The reason I am not tracking to 10K on this oil change is that I about 10% of the miles on this oil are fiberglass boat towing miles.

I am planning to change oil going forward at 7,500 mile change intervals, or when my oil life remaining is 20%, whichever comes sooner. I know that when I get heavy into fishing season this summer that all the boat towing may end up having me changing oil in the 5,000-7,500 mile range.

There is another thread that was previously opened up on this oil change interval subject, so anyone tracking this thread may want to get caught up by reading all the posts in that other thread, with link to that provided below. From the research I and others have done, the biggest impact to oil life is driving conditions--extreme/severe driving conditions, long idle hours (as one may accumulate with 70% city driving), etc. The original thread on this topic started by @jmperlik will provide more considerations -->
https://www.dieself150forum.com/foru...remaining.html

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