I hate the "Time Based" Oil Life Monitor - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

I hate the "Time Based" Oil Life Monitor

Old 10-09-2018, 11:03 AM
  #1  
Walt White Coupe
CF Senior Member
Thread Starter
 
Walt White Coupe's Avatar
 
Member Since: Jun 2005
Location: Phila Suburbs 2016 C7 & 2013 650ix
Posts: 8,608
Thanked 714 Times in 431 Posts
Default I hate the "Time Based" Oil Life Monitor

So I normally change my oil every year when I get my car inspected. And my car usually has 3500 to around 4500 miles per year at the time of inspection. As a comparison at that point my C6 would have said I had ~40 % or more life left. So this year at about an 11 month interval since the last change and 3000 miles driven, I'm down to 2% life left on the oil. That's absurd.
Walt White Coupe is offline  
Old 10-09-2018, 11:13 AM
  #2  
jcthorne
CF Senior Member
 
jcthorne's Avatar
 
Member Since: Jun 2015
Posts: 1,069
Thanked 125 Times in 96 Posts
Default

No, its the recommended change interval. Feel free to disagree with GMs recommendation, but the monitor is working as designed.

I have never relied on these monitors on past models as they were inaccurate to borderline useless. This one actually works.
jcthorne is offline  
The Following 2 Users Say Thank You to jcthorne For This Useful Post:
Maxie2U (10-09-2018), spinkick (10-10-2018)
Old 10-09-2018, 11:30 AM
  #3  
Mayor111
CF Senior Member
 
Mayor111's Avatar
 
Member Since: Oct 2016
Location: Easton PA
Posts: 1,084
Thanked 288 Times in 191 Posts
Default

Just get in the habit of changing it at the end of the season (if you live where seasons change) and you wont have anything to worry about. If you live in a warm climate area, then pick a date and then always change it on that date...SIMPLE! Your not driving enough to not go by a date...just ignore the monitor and reset whenever needed. Remember GM states the oil should not go beyond 1 year without changing - REGARDLESS of the mileage...
Mayor111 is offline  
The Following User Says Thank You to Mayor111 For This Useful Post:
Maxie2U (10-09-2018)
Old 10-09-2018, 11:51 AM
  #4  
Gunny27
Junior Member
 
Member Since: Mar 2014
Location: Madison Alabama
Posts: 21
Thanked 8 Times in 4 Posts
Default

Drive it more and take the time factor out of the equation
Gunny27 is offline  
The Following 4 Users Say Thank You to Gunny27 For This Useful Post:
beaversstonehaven (10-09-2018), Bigfoot16 (10-10-2018), C6_Racer_X (10-09-2018), owc6 (10-09-2018)
Old 10-09-2018, 11:52 AM
  #5  
Walt White Coupe
CF Senior Member
Thread Starter
 
Walt White Coupe's Avatar
 
Member Since: Jun 2005
Location: Phila Suburbs 2016 C7 & 2013 650ix
Posts: 8,608
Thanked 714 Times in 431 Posts
Default

I do change it once a year at inspection time. I feel that the "Oil Life Monitor" is overly conservative.
Walt White Coupe is offline  
Old 10-09-2018, 11:53 AM
  #6  
JMII
CF Senior Member
 
JMII's Avatar
 
Member Since: Jul 2018
Location: Margate, FL
Posts: 200
Thanked 54 Times in 43 Posts
Default

Originally Posted by Walt White Coupe View Post
So I normally change my oil every year when I get my car inspected.
So your complaining the OLM is telling you to change the oil on the schedule you already follow? OK... if it makes you feel better in 6 months reset it, then it will tell you that 50% is left when your inspection is due. Problem solved.
JMII is offline  
The Following 2 Users Say Thank You to JMII For This Useful Post:
rogergcam (10-09-2018), speedlink (10-09-2018)
Old 10-09-2018, 11:55 AM
  #7  
proexpert
CF Senior Member
 
proexpert's Avatar
 
Member Since: Apr 2002
Location: Harrisburg PA
Posts: 2,107
Thanked 214 Times in 152 Posts
Default

2% is GM's absurd opinion about the oil life. The oil is probably good for many more years at that mileage rate. Your car is one of my favorites.

Last edited by proexpert; 10-09-2018 at 11:55 AM.
proexpert is offline  
The Following User Says Thank You to proexpert For This Useful Post:
Walt White Coupe (10-09-2018)
Old 10-09-2018, 12:14 PM
  #8  
Patman
CF Senior Member
 
Patman's Avatar
 
Member Since: May 2001
Location: Oakville Ontario
Posts: 13,212
Thanked 1,110 Times in 688 Posts
Default

Originally Posted by jcthorne View Post

I have never relied on these monitors on past models as they were inaccurate to borderline useless. This one actually works.
I found the OLM in the C5 and the C6 to be very accurate, I would wait for the oil life to hit zero before changing the oil and my oil analysis results showed the oil still had life left in it. So I'm curious to how you come up with the idea that they were inaccurate when my results proved otherwise (unless you're talking about cars other than the Corvette)

I understand Walt's beef here though, because if he's only putting 3500 to 4500 miles a year on his car he can easily do 12 month oil changes, but with time being added to the algorithm now it wants him to change it after only 11 months. So for some people if they followed the OLM to the letter like this, and they were previously doing oil changes at the same time each year (either because of inspection or to do it just before winter storage), this now makes things a little more inconvenient. In cases like this I would say to reset the OLM but wait to change the oil until the actual one year mark, then reset the OLM once again.
Patman is offline  
The Following 2 Users Say Thank You to Patman For This Useful Post:
NSC5 (10-09-2018), Walt White Coupe (10-09-2018)
Old 10-09-2018, 12:30 PM
  #9  
Walt White Coupe
CF Senior Member
Thread Starter
 
Walt White Coupe's Avatar
 
Member Since: Jun 2005
Location: Phila Suburbs 2016 C7 & 2013 650ix
Posts: 8,608
Thanked 714 Times in 431 Posts
Default

Actually, I have been ignoring the monitor and just doing my normal yearly oil change. But I'm sure there are some of the more **** people here following the monitor to the tee.
Walt White Coupe is offline  
Old 10-09-2018, 12:33 PM
  #10  
mschuyler
CF Senior Member
 
mschuyler's Avatar
 
Member Since: Feb 2016
Location: Bainbridge Island WA
Posts: 3,157
Thanked 1,880 Times in 865 Posts
Default

I figure if it's under warranty, do what it says. If it is out of warranty, do what you want. Of all the things it is possible to "hate" about a Corvette, this is not something I would ever pick.
mschuyler is online now  
The Following User Says Thank You to mschuyler For This Useful Post:
speedlink (10-09-2018)
Old 10-09-2018, 12:53 PM
  #11  
Walt White Coupe
CF Senior Member
Thread Starter
 
Walt White Coupe's Avatar
 
Member Since: Jun 2005
Location: Phila Suburbs 2016 C7 & 2013 650ix
Posts: 8,608
Thanked 714 Times in 431 Posts
Default

I love the car, maybe dislike would be more accurate.
Walt White Coupe is offline  
Old 10-09-2018, 01:23 PM
  #12  
Foosh
CF Senior Member
 
Foosh's Avatar
 
Member Since: Oct 2004
Location: Maryland/DC Metro
Posts: 14,386
Thanked 5,609 Times in 3,276 Posts
Default

I like it a lot.

I drive my car year-round in almost daily use and keep the revs up more than the average driver. Thus, I know the OLM is clearly doing it's job well, because I'm generally only getting 5K miles between changes with the OLM winding down. That's about 5 months for me. I change it when it's approximately 20%.

Type of use and time are all important factors as to when a change is necessary for max engine protection and life, and the OLM algorithm does a terrific job of factoring all that in.

Last edited by Foosh; 10-09-2018 at 01:45 PM.
Foosh is offline  
The Following 4 Users Say Thank You to Foosh For This Useful Post:
4thC4at60 (10-09-2018), blkvet6 (10-10-2018), Maxie2U (10-09-2018), speedlink (10-09-2018)
Old 10-09-2018, 01:43 PM
  #13  
trivette
CF Senior Member
 
trivette's Avatar
 
Member Since: Feb 2004
Location: st paul minnesota
Posts: 2,167
Thanked 91 Times in 74 Posts
Default

I change mine annually right before storage, which is Nov. 1st. I added about 5,000 miles this Summer, mostly highway miles, and it's down to 8% on the monitor. By the end of October it will time out to 0 which would be where I expect it to be for the annual change.
trivette is offline  
Old 10-09-2018, 02:21 PM
  #14  
LimeRay
CF Senior Member
 
Member Since: Nov 2013
Posts: 504
Thanked 185 Times in 111 Posts
Default

It's a bunch of crap. I only put 4K on mine in the last 14 months, oil is in great shape. I will ride it for a few more months before I have it changed.
LimeRay is offline  
The Following User Says Thank You to LimeRay For This Useful Post:
jimmie jam (10-10-2018)
Old 10-09-2018, 02:21 PM
  #15  
Bavaria
CF Senior Member
 
Member Since: Oct 2014
Location: Goodyear Arizona
Posts: 623
Thanked 67 Times in 50 Posts
Default

I agree with the OP. We have two Lexus', and they advise to change the oil every 10k miles - no time frames. For us, that can be over two years between changes, and it hasn't resulted in any problems. The cars are an '07 with 92k miles, and a '10 with just shy of 70k miles (will have its oil/filter changed within a month).
I will also follow the 10k miles schedule on the C7 after the warranty expires, however, I have no doubt the car would have no oil-related issues at the 10k mile mark regardless of what the OLM advises. In almost 60 years of driving, obviously most of them prior to pre-synthetic oil availability, none of my dozens of cars dating back to a '58 VW has ever had an oil-related problem.
Bavaria is offline  
Old 10-09-2018, 03:05 PM
  #16  
Avanti
CF Senior Member
 
Avanti's Avatar
 
Member Since: Mar 2001
Location: Bonneville Salt Flats, 223mph Aug. '04
Posts: 5,156
Thanked 461 Times in 322 Posts
Default

So, simply reset it and go on.
Avanti is offline  
The Following User Says Thank You to Avanti For This Useful Post:
Mike Mercury (10-10-2018)
Old 10-09-2018, 03:17 PM
  #17  
c54u
CF Senior Member
 
c54u's Avatar
 
Member Since: Aug 2006
Posts: 1,986
Thanked 330 Times in 246 Posts
Default

I have never changed oil as often in any car that I owned compared to my 2017 Stingray.
1st at 3000 miles (65% left showing on oil monitor) in fall 2017 and put away for winter
2nd at 7100 miles (56% left showing on oil monitor) in spring 2018
3rd at 11500 miles (44% left showing on oil monitor) in fall (today actually) 2018 going to put away in a few weeks for winter
4th at (estimating mileage here) 14500 miles summer 2019 ---> this will be my last free oil change from GM at the dealership.

I must say that my oil always looks very clean every time I check it and the car runs great.
In 2020 I will start doing my own oil changes once a year.

c54u is offline  
Old 10-09-2018, 03:49 PM
  #18  
Zaphod B
CF Senior Member
 
Member Since: Nov 2015
Posts: 295
Thanked 103 Times in 51 Posts
Default

Like Foosh, I drive my car year-round and almost daily, and I lean on it exuberantly. This translates to oil changes approx every 7 - 8 months.

Just my opinion, but if the OLM is conservative that's fine with me. I'd rather be changing out oil that still does its job, than oil that hasn't been. Also, warranty.

Another note. GM owns the patent for the OLM used in most vehicles. See https://patents.google.com/patent/US20120044077. I would imagine that the inputs and weights given to the various parameters are specific to each application. So what you experienced in a C6 won't be the same as what you see in your C7, or any other car.
Zaphod B is offline  
Old 10-09-2018, 07:58 PM
  #19  
gpotski
CF Senior Member
 
gpotski's Avatar
 
Member Since: Jul 2004
Location: Lima Ohio
Posts: 10,370
Thanked 72 Times in 45 Posts
Default

Looks like GM wants to go back to the 3000 mile oil changes ("cheap insurance.")



I also know the oil is not shot at 5000 miles, and the annual change is ridiculous.

I've got about 4500 miles on my oil, and changed it myself on 10/10/17.

The oil looks pristine on the dipstick. Sure, I better change it.

I will change it before winter storage, but it is a waste.
gpotski is offline  
Old 10-09-2018, 08:28 PM
  #20  
JerryU
2017 GS, M7, 2.5LT
Support Corvetteforum!
 
JerryU's Avatar
 
Member Since: Sep 2007
Location: South Carolina
Posts: 11,297
Thanked 2,199 Times in 1,641 Posts
Default



PS: E
Originally Posted by Walt White Coupe View Post
Actually, I have been ignoring the monitor and just doing my normal yearly oil change. But I'm sure there are some of the more **** people here following the monitor to the tee.
Hmm, up to this posted quote most have been as wrong as you! (I’m sure others will also state the issues correctly!).

My 1988, 1993, 2008 owner’s manual have ALL said change at xxx miles OR if it had one when the OLM said OR “1 year” WHICHEVER OCCURS FIRST!

In fact I’ll quote my ‘93 40th Anniverstity Vette Owner’s Manual:
It stated: “Change at 7500 miles OR ONE YEAR WHICHEVER OCCURS FIRST.”
ALSO, it stated: “If most driving is under 4 miles change at 3000 miles or THREE MONTHS WHICHEVER OCCURS FIRST!”

DETAILS:
You’re not changing oil only because it wears out! Starts are the worse thing for oil and your engine. Blowby from the extra piston to cylinder wall clearance causes combustion products to pass the cold aluminum pistons untill the ~2500 F combustion temps heat them up and they expand. Water is a combustion product. It mixes with sulfur and other “stuff” to form acids etc that cause corrosion. The OLM considers after each start how hot and how long the oil reaches temps that evaporate much of that water. It uses other factors, like engine revs etc as well. In fact mileage and time were OK because that is all we had in the past!

The ‘93 Owner’s Manual (and all other cars/trucks I have owned) stated for sever service change at ~3 months. Would you prefer that GM “guess” than actual measurements?? Recall dealers and Jiffy Lub using 3000 miles on the “when to replace stickers?” They had other motives BUT their justification was that sever service use statement. They could justify as they did not know how you drove!

My Street Rod, that mostly goes to Car Shows gets it’s oil changed once a year! I can “see those steel cylinder walls rusting from contaminated oil.” It’s 8.2 Liter BB runs as good now as when I semi-retired and built it 18 years ago! Cheap insurance, IMO as well as GMs!

In fact I do one other thing with the Street Rod folks might consider, especially those with dry sumps. Since it’s not used often and blocks things like my long ladders in the garage I avoid backing it out removing whatever and pulling it straight back in! I try to drive it ~25 miles to get the oil hot and evaporate blowby (also to have fun!). Especially for those who put few miles on the Vette driving to a store 3 miles away- probably the worse thing you can do for you car! But it’s your car do as you wish!

PS:
For folks who do change their oil once a year BUT don’t like GM just showing the time progression as it gets to a year, WHAT SHOULD THEY DO? I SURE WOULD NOT BE HAPPY IF IT DISPLYED NOTHING UNTILL SAY 5% LEFT!

I have no issues since I don’t look at the OLM display untill nearing the one year. Why do you bother?

Sorry for the long post but this has been one of my fun subjects since I got my September 2013 built C7 Z51!











Last edited by JerryU; 10-09-2018 at 09:48 PM.
JerryU is offline  

Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: