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Oil change time interval #5107300 05/16/19 11:37 PM
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ym42 Offline OP
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Hi BITOG folks! I have an old high mileage back up car - Mustang 4.6*V8 that I do not drive much these days. How long can I keep the synthetic oil inside the engine before changing it? I do not drive much, but when I do, its all long highway trips... What is the best place for a buck to get a UOA that includes TBN? Thanks!

Re: Oil change time interval [Re: ym42] #5107309 05/17/19 12:03 AM
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Jetsfan421 Offline
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Oil change interval can vary based on the condition of the engine and if it's leaking oil. Most people here say 5k for conventional or semi-synthetic. And 10k for full synthetic. Age and mileage would also help. Older engines aren't as picky as modern gdi engines.

Re: Oil change time interval [Re: ym42] #5107310 05/17/19 12:07 AM
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Jetsfan421 Offline
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If you don't put more than 10k miles per year I'd say once a year with a quality synthetic like qsud or Castrol edge.

Re: Oil change time interval [Re: Jetsfan421] #5107313 05/17/19 12:24 AM
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JLTD Offline
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Originally Posted by Jetsfan421
If you don't put more than 10k miles per year I'd say once a year with a quality synthetic like qsud or Castrol edge.



...and if it's less than 5k per year, go 2 years. Mostly highway is easy on oil, as is the 4.6.

How many miles per year?


I use the overseas manual to choose my oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, SS 5w20/Amsoil

Re: Oil change time interval [Re: ym42] #5107330 05/17/19 01:28 AM
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FordCapriDriver Online Content
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Depends on the TBN of the oil, high TBN will be able to neutralize acids in the oil more time than a lower TBN oil.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Oil change time interval [Re: ym42] #5107333 05/17/19 01:33 AM
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Panos Offline
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Originally Posted by ym42
Hi BITOG folks! I have an old high mileage back up car - Mustang 4.6*V8 that I do not drive much these days. How long can I keep the synthetic oil inside the engine before changing it? I do not drive much, but when I do, its all long highway trips... What is the best place for a buck to get a UOA that includes TBN? Thanks!


Three years easily.Even after this interval ,if you get a UOA you should get a result of a perfectly serviceable oil that you could use even longer.


Ford Fiesta 1.6 '05 - Motul specific 913D/Motul Gear 300 180K+ Kms
Kawasaki Ninja 250R '08 - Shell Advance Ultra 4T 10w40 75K+ Kms
Honda CBR600F pc41 '14 - Motul 7100 10w30 25K+ Kms
Re: Oil change time interval [Re: ym42] #5107356 05/17/19 04:17 AM
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demarpaint Offline
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Originally Posted by ym42
Hi BITOG folks! I have an old high mileage back up car - Mustang 4.6*V8 that I do not drive much these days. How long can I keep the synthetic oil inside the engine before changing it? I do not drive much, but when I do, its all long highway trips... What is the best place for a buck to get a UOA that includes TBN? Thanks!

If you care about the car do a UOA and be certain. I'm not a fan of blanket statements, they can get you in trouble. Check out Rock Auto for the Wix UOA kit, It is currently under $10 and includes TBN. If you can't locate it shoot me a PM and I'll send you a link.


God Bless Our Troops

Re: Oil change time interval [Re: ym42] #5107434 05/17/19 07:39 AM
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Gebo Offline
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My son goes once a year on his car that sits here in our driveway (doesn't want to take it to the apt complex). He drives it about 2K a year. When he drives it, he always goes 30 hwy miles at least and usually several hundred miles before stopping.

My Mom's '97 Buick goes about 3 miles twice a week. I change it every 6 months.

From what you are describing it would appear you could go a year between changes. demarpaint appears to have the best option for a UOA kit. I'd do one at 6 months and another at 1 year just for kicks and information.


'98 LEX LS400 295K
'02 4Runner 240K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Oil change time interval [Re: ym42] #5107445 05/17/19 07:57 AM
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ejes Offline
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I do 5k OCI's and have one vehicle that sometimes doesn't get 5k on it in a year. Personally, I change oil on a year or 5k interval, whichever comes first, when that is the case.

Re: Oil change time interval [Re: ym42] #5107518 05/17/19 09:05 AM
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BLND1 Offline
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Hey OP,

I too have a high mileage 4.6 v8 mustang. Mine consumes about a quart every 3k Miles, and I use a high mileage oil (maxlife syn) which seems to help.

Mine gets driven a bit more than yours, but I only change the oil once a year with a quality synthetic.

You could probably stretch a quality synthetic two years if you wanted. I wouldn’t worry about a UOA unless you just wanted one for giggles.

Re: Oil change time interval [Re: ym42] #5107522 05/17/19 09:09 AM
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Quattro Pete Offline
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A UOA would be a good idea, but without it, if you don't put on too many miles, I'd guess a 2-year OCI might be OK.


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Oil change time interval [Re: ym42] #5107559 05/17/19 09:59 AM
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Vaca Offline
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Originally Posted by ym42
Hi BITOG folks! I have an old high mileage back up car - Mustang 4.6*V8 that I do not drive much these days. How long can I keep the synthetic oil inside the engine before changing it? I do not drive much, but when I do, its all long highway trips... What is the best place for a buck to get a UOA that includes TBN? Thanks!


I have a similar situation with an older Porsche, I drove it around 4500 miles last year without changing the oil, and maybe 3000 or 4000 this year and plan to change it this Fall. It's a large sump at nearly 10 quarts and I use a high TBN oil, Mobil 1 0w-40 FS. Also, I usually drive it longer distances like a road trip here or there, but also some back country road cruising on some shorter runs.

I have confidence two years will be fine. I'm not going two years between changes to save money per se, I really believe two years is totally fine. It sounds like you're in a similar situation with your Mustang. And like you and others have mentioned, a UOA certainly wouldn't hurt for extra confidence.

Re: Oil change time interval [Re: ym42] #5107634 05/17/19 11:50 AM
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Dyusik Offline
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A WIX UOA is around 15 bucks.
There are plenty of UOA results backing the "Oil can't tell time" statement, just search for UOA of 2+ years, there are some good ones.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 111K Frankenbrew, WIX 57173 (4 sale)
04 YZF-R1 20K Frankenbrew 20w50ish, XG7317
14 RX450h 41k Idemitsu 0w20, WIX 57047
18 RAM 3500 2k VWB 15w40, DBL7349
Re: Oil change time interval [Re: ym42] #5107643 05/17/19 12:08 PM
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I change at 5k on all my vehicles; on the truck and XTerra, it's possible that might go over a year. The only time I've ever changed based on time is the extreme example of my old Cavalier that sat in the yard unused for 3 years. I changed all fluids before driving it again, put 25k on it, and then got rid of it.


2015 Nissan Versa Note 1.6/5MT
2012 Toyota Tacoma 2.7/4AT
2007 Toyota Camry 2.4/5AT
2005 Nissan XTerra 4x4 4.0/6MT
2002 Mustang GT Convertible 4.6/5MT
2009 Kawasaki Vulcan 900
2013 Hyosung ST7
Re: Oil change time interval [Re: ym42] #5107726 05/17/19 01:43 PM
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Linctex Offline
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My 1997 Mustang GT 5-speed gets about 6,000 miles over three years. I change the oil every 3 years.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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