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Re: Do I need to change the oil yearly? [Re: Stone150] #4650724 01/30/18 03:18 AM
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SonofJoe Offline
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I'm a typical low yearly mileage kind of bloke; maybe 6k/year. Wifey is even lower at 3k/year max.

I used to own a Kia and partly bought it for the 7 year warranty. However to maintain the warranty, you need to get the car serviced every year. In the UK, this is a significant cost (typically 250 or $US 350 a pop!) relative to the diminishing value of the car.

So I purposely traded in the Kia for my Suzuki which just has a 3 year warranty. During the warranty period, I'm getting the first two yearly services done but after that, I'm moving to getting it serviced every other year. The recommended OCI is 12.5k miles, the dealer uses Petronas (Group III) Synthium 0W20 and the bulk of my driving is moderate (55 mph) jaunts up & down the motorway. Oil is remarkably stable & long lasting under such conditions so I'm going to be fine. I'll probably check the dipstick every once in a while and top up as necessary.

Re: Do I need to change the oil yearly? [Re: Stone150] #4651225 01/30/18 03:30 PM
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Stone150 Offline OP
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thanks everyone, I appreciate the help


2001 Silverado 5.3L
2015 GMC Sierra 5.3L
2008 Z06 7.0L
2016 CTS-V
2016 ATS-V, Manual (wifes)
2003 Ford Escape 3.0L
Re: Do I need to change the oil yearly? [Re: Stone150] #4651273 01/30/18 04:12 PM
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lovcom Offline
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What about oxidation of the oil? Its not like its in a bottle all sealed up, air tight...

Isn't oxidation the reason car makers say to change the oil after X miles or Y months?


2014 Toyota Prius C, City 62 MPG, Hwy 50 MPG.
Re: Do I need to change the oil yearly? [Re: Stone150] #4651281 01/30/18 04:19 PM
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SHOZ Offline
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How does GMs oil life monitors handle this?

On My JD mower I went to every other year with about 50 hrs a year.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Do I need to change the oil yearly? [Re: SHOZ] #4651395 01/30/18 05:35 PM
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Patman Offline
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Originally Posted By: SHOZ
How does GMs oil life monitors handle this?



In the case of the OPs 2008 Corvette, the oil life monitor does not use time as a factor so he could go 2-3 years and as long as he didn't do a lot of miles, the monitor would still be above zero.

In the case of my 2018 Corvette, it has a time factor built into the oil life monitor now (it started with the 2014 model actually) It will always hit the zero mark at or before the one year mark, even if you don't drive the car at all.


2018 Corvette, 17k, M1 ESP Formula 5w30 & NAPA Gold
2006 Civic EX Coupe, 152k, PUP 5w20 & Fram Ultra
2010 BMW 328i X-Drive,121k, GC 0w40 & Fram Ultra

Re: Do I need to change the oil yearly? [Re: Stone150] #4651416 01/30/18 05:58 PM
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SevenBizzos Offline
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This is a good scenario for a UOA. Do it next fall and see. I bet you can get two years comfortably.


2018 Ford Edge Sport 18k - Amsoil XL 5W-30, EA15k43
2009 Hyundai Sonata V6 Limited 167k - Mobi1 5W-20 HM, Fram Ultra Syn XG9999 frown
2002 Mustang GT 75k - Amsoil XL 5W-20, EA011,Rained on 7 times
Re: Do I need to change the oil yearly? [Re: Stone150] #4651578 01/30/18 09:57 PM
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BrocLuno Offline
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I have left oil in an engine in a pick-up that got about 2,000 miles a year for up to four years. Was fine. As long as it starts with reasonably high TBN and not much moisture gets added, you're good to go smile

Of course a UOA would be good... But I'll bet lunch that they will come back saying it can go longer smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Do I need to change the oil yearly? [Re: lovcom] #4651682 01/31/18 03:21 AM
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SonofJoe Offline
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Originally Posted By: lovcom
What about oxidation of the oil? Its not like its in a bottle all sealed up, air tight...

Isn't oxidation the reason car makers say to change the oil after X miles or Y months?


For an engine oil to oxidise, it needs to be hot and in the presence of hot, replenished blow-by gas. When your car's at rest, the oil is cold and there's only a static volume of gas sitting above the oil, so oxidation is to all intents & purposes, zero. Even when your oil's at say 100C and you're tootling along at say 2500 rpm, the rate of oxidation of any modern engine oil is minimal. However if you start really pushing the engine (say you are track driving) then everything gets way hotter and there's a lot more blow-by traversing the crankcase. In those conditions, the rate of oil oxidation will increase exponentially.

The usual OEM recommendation to change your oil every year isn't so much 'fact based' as it is a matter of convenience (once a year is easy to remember!). Also bear in mind that both the OEMs & oil companies are not disinterested parties when it comes recommending OCIs (one wants you to use the best oil to protect 'their' engine whilst the other wants to sell you as much oil as possible).

I liken OEM OCI recommendations to those dentists that 'recommend' you go for six monthly 'check-ups'. He spends ten minutes looking at your teeth, takes a couple of X-rays, tells you're doing a great job of looking after your teeth and sends you on your merry way but not before parting you from 50! The entire arrangement favours the dentist far more than it does you...

Last edited by SonofJoe; 01/31/18 03:23 AM.
Re: Do I need to change the oil yearly? [Re: Stone150] #4651733 01/31/18 07:22 AM
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zeng Offline
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Could a one year oil change regime be intended to limit winter season to one at sub-zero temperates region ?

Re: Do I need to change the oil yearly? [Re: Stone150] #4651872 01/31/18 10:33 AM
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bigt61 Offline
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If you aren't racing it I'd change it every 5000 miles at your minimal driving rate - especially with 8 quarts. Even if it took 10 years. If you haven't gone 5k miles in 10 years, go ahead and change it. I'm assuming the car is garaged. Here's my Suburban UOA after 5 years ......https://bobistheoilguy.com/forums/ubbthreads.php/topics/4190879/1992_Surburban_Big_Block_-_M1_#Post4190879


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: Do I need to change the oil yearly? [Re: Stone150] #4652531 01/31/18 08:59 PM
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JFAllen Offline
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You have a nice sports car and you're thinking about this all wrong. Oil changes are cheap (especially in the USA.) Just drive it more often and feel less guilty about doing an annual oil change. You bought the car, and it's no good to you gathering dust in the garage. Get it out on the road with your Wife riding shotgun.

Enjoy it, don't store it!!

Regards
Jordan

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