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Oil change time interval #5107300
05/16/19 11:37 PM
05/16/19 11:37 PM
Joined: Apr 2005
Posts: 14
Cherry Hill, NJ
ym42 Offline OP
ym42  Offline OP

Joined: Apr 2005
Posts: 14
Cherry Hill, NJ
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
05/17/19 12:03 AM
Joined: Jan 2019
Posts: 59
Illinois
Jetsfan421 Offline
Jetsfan421  Offline

Joined: Jan 2019
Posts: 59
Illinois
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
05/17/19 12:07 AM
Joined: Jan 2019
Posts: 59
Illinois
Jetsfan421 Offline
Jetsfan421  Offline

Joined: Jan 2019
Posts: 59
Illinois
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
05/17/19 12:24 AM
Joined: Dec 2017
Posts: 2,110
US
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 2,110
US
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 147k, SS5w30/Amsoil

His: 2015 4Runner 53k, OE5w30/Wix

Re: Oil change time interval [Re: ym42] #5107330
05/17/19 01:28 AM
05/17/19 01:28 AM
Joined: Oct 2015
Posts: 3,004
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 3,004
Balearic Islands , Spain
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, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort XR3i Cabrio, - Shell Rimula R4X 15W-40
G40 Si-OAT coolant in both


Re: Oil change time interval [Re: ym42] #5107333
05/17/19 01:33 AM
05/17/19 01:33 AM
Joined: Dec 2016
Posts: 126
Greece
Panos Offline
Panos  Offline

Joined: Dec 2016
Posts: 126
Greece
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
Kawasaki Ninja 250R '08 - Shell Advance Ultra 4T 10w40
Honda CBR600F pc41 '14 - Motul 7100 10w30
Re: Oil change time interval [Re: ym42] #5107356
05/17/19 04:17 AM
05/17/19 04:17 AM
Joined: Jul 2005
Posts: 32,144
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,144
NY
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
05/17/19 07:39 AM
Joined: Sep 2002
Posts: 2,758
VA
Gebo Offline
Gebo  Offline

Joined: Sep 2002
Posts: 2,758
VA
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 235K
'05 Lex LS430 85K
'07 Lex GX470 65K

Schaeffer Oil
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
(Subject to Change as the Wind Blows)
Re: Oil change time interval [Re: ym42] #5107445
05/17/19 07:57 AM
05/17/19 07:57 AM
Joined: Jan 2016
Posts: 337
Kansas
ejes Offline
ejes  Offline

Joined: Jan 2016
Posts: 337
Kansas
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
05/17/19 09:05 AM
Joined: Nov 2018
Posts: 179
CA
BLND1 Offline
BLND1  Offline

Joined: Nov 2018
Posts: 179
CA
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
05/17/19 09:09 AM
Joined: Oct 2002
Posts: 37,410
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 37,410
Great Lakes
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.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Oil change time interval [Re: ym42] #5107559
05/17/19 09:59 AM
05/17/19 09:59 AM
Joined: Dec 2006
Posts: 319
South Central PA
Vaca Offline
Vaca  Offline

Joined: Dec 2006
Posts: 319
South Central PA
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
05/17/19 11:50 AM
Joined: Sep 2014
Posts: 2,230
US-WA
Dyusik Offline
Dyusik  Offline

Joined: Sep 2014
Posts: 2,230
US-WA
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 110K Frankenbrew, WIX 57173
04 YZF-R1 19K DELO 15w40, XG7317
14 RX450h 41k Idemitsu 0w20, WIX 57047
Re: Oil change time interval [Re: ym42] #5107643
05/17/19 12:08 PM
05/17/19 12:08 PM
Joined: Feb 2007
Posts: 1,231
Perris, CA
Anduril Offline
Anduril  Offline

Joined: Feb 2007
Posts: 1,231
Perris, CA
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
05/17/19 01:43 PM
Joined: Dec 2016
Posts: 8,459
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,459
Waco, TX
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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