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Synthetic for a 30 year old engine? #4876372
09/23/18 12:02 AM
09/23/18 12:02 AM
Joined: Mar 2011
Posts: 47
California
geissjr Offline OP
geissjr  Offline OP

Joined: Mar 2011
Posts: 47
California
I just purchased a 1989 Camaro with 67k original miles. The owner has serviced the car well, but has always used conventional oil. Can I convert to synthetic or is this going to cause problems? Thank you.


2015 GMC Sierra M1 0w-20
2016 Mercedes Benz GLE M1 0w-40
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876373
09/23/18 12:06 AM
09/23/18 12:06 AM
Joined: Mar 2017
Posts: 212
South Wales, UK
Bailes1992 Offline
Bailes1992  Offline

Joined: Mar 2017
Posts: 212
South Wales, UK
You'll be fine. Maybe look at a high mileage oil or using an additive with seal conditioners just incase.


'13 Suzuki Jimmny - '16 Dacia Duster 1.5DCi 4WD
'96 LR Defender 300TDi - '12 BMW 320d

Engine Oil - Fuchs Titan XTL GT1 5w40
Gearbox Oil - Fuchs Sintofluid 75w80
Diff Oil - Fuchs Sintopoid 75w90
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876374
09/23/18 12:11 AM
09/23/18 12:11 AM
Joined: Oct 2014
Posts: 13,009
Canyon County Idaho
CT8 Online content
CT8  Online Content

Joined: Oct 2014
Posts: 13,009
Canyon County Idaho
Why?


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876384
09/23/18 12:52 AM
09/23/18 12:52 AM
Joined: Oct 2015
Posts: 2,883
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 2,883
Balearic Islands , Spain
If the seals and gaskets are in good shape and the car has been generally maintained well then yeah no problem i guess.
On an engine that leaks oil, and is cruddy inside i would not.

Last edited by FordCapriDriver; 09/23/18 12:53 AM.

1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Both on G40 Si-OAT coolant.
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876385
09/23/18 12:56 AM
09/23/18 12:56 AM
Joined: Feb 2013
Posts: 11,233
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline

Joined: Feb 2013
Posts: 11,233
Phoenix, AZ
At 30 years old, I don't see the point. Are you going to be putting a ton of miles on it?

Unless the gaskets have been changed recently, I wouldn't bother.

Although I do run a 1970 VW Beetle on synthetic, but it's already got oil leaks everywhere, it's parked in gravel, and sees very low mileage.


2015 Hyundai Sonata 2.4L 91k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876396
09/23/18 02:00 AM
09/23/18 02:00 AM
Joined: Mar 2016
Posts: 1,163
MT
jongies3 Offline
jongies3  Offline

Joined: Mar 2016
Posts: 1,163
MT
Stick with what's worked for the past 30 years!


2004 Toyota Tacoma 3.4 V6: Mobil 1 AFE 0W-30, FRAM TG-3600 filter
1969 Mustang Mach 1 5.8 V8: PYB 10W-30 Napa Gold 1515 filter
1997 Ford F-250 HD 7.3 Powerstroke V8: T6 5W-40 FRAM PH-3786 filter
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876409
09/23/18 03:12 AM
09/23/18 03:12 AM
Joined: Aug 2017
Posts: 293
Cincinnati, USA
Dave9 Offline
Dave9  Offline

Joined: Aug 2017
Posts: 293
Cincinnati, USA
Put in conventional oil once. Run it a few hundred miles. Look for leaks and loss of (burning) oil. You can't go by what came in it when sold to you, might just be high viscosity goop meant to quiet the engine.

Anyway with the correct conventional in you have a baseline. If seals are leaking, switching to synthetic will probably make it worse with all else equal, but you can use high mileage synthetic with seal conditioners.

If the seals are not leaking with conventional oil, do not put high mileage conventional or synthetic in. It does nothing good for seals until they start leaking.

If you switch to synthetic and THEN it starts leaking, I'd top it off with high mileage oil and switch to 50% high mileage oil on the next change, not using more of the stuff than needed to keep leaks under control.

Shorter answer: Sure it's a good idea to switch to synthetic but don't try to drop down to 5W-20 because the engine is designed for 10W-30 or thicker.

Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876413
09/23/18 03:23 AM
09/23/18 03:23 AM
Joined: May 2005
Posts: 10,891
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline

Joined: May 2005
Posts: 10,891
ROCHESTER, NY
Yes, you can switch to synthetic oil. Will you have leaking issues? It remains to be seen.
Since the engine has been well maintained according to the previous owner, there shouldn't be any sludge in the engine therefore, the synthetic oil shouldn't have any sludge to remove which could cause some future oil leaking!
My 38 year old Firebird V8 engine has ONLY used conventional oil all of it's life but, I don't drive it hard.
However, with most conventional & high mileage oils now being a synblend, I guess I am using some syn oil.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Synthetic for a 30 year old engine? [Re: Dave9] #4876419
09/23/18 04:00 AM
09/23/18 04:00 AM
Joined: Mar 2017
Posts: 212
South Wales, UK
Bailes1992 Offline
Bailes1992  Offline

Joined: Mar 2017
Posts: 212
South Wales, UK
Originally Posted by Dave9


Anyway with the correct conventional in you have a baseline. If seals are leaking, switching to synthetic will probably make it worse with all else equal, but you can use high mileage synthetic with seal conditioners.

If the seals are not leaking with conventional oil, do not put high mileage conventional or synthetic in. It does nothing good for seals until they start leaking.

If you switch to synthetic and THEN it starts leaking, I'd top it off with high mileage oil and switch to 50% high mileage oil on the next change, not using more of the stuff than needed to keep leaks under control.

Shorter answer: Sure it's a good idea to switch to synthetic but don't try to drop down to 5W-20 because the engine is designed for 10W-30 or thicker.


Disagree with the high mileage oil.

The seals conditioners help to ensure the old seals are elastic and pliable. Regardless of oil leaks or not they're worthwhile on older cars!

Agree with the viscosity. Keep the same operational viscosity. I.e. if you're using a 15w40 you could go for Castrol Edge 0w40.


'13 Suzuki Jimmny - '16 Dacia Duster 1.5DCi 4WD
'96 LR Defender 300TDi - '12 BMW 320d

Engine Oil - Fuchs Titan XTL GT1 5w40
Gearbox Oil - Fuchs Sintofluid 75w80
Diff Oil - Fuchs Sintopoid 75w90
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876431
09/23/18 05:16 AM
09/23/18 05:16 AM
Joined: Apr 2017
Posts: 435
Mississippi
Speak2Mountain Offline
Speak2Mountain  Offline

Joined: Apr 2017
Posts: 435
Mississippi
I'd run PYB or Castrol UltraClean 1st and check for leaks. If no leaks, I'd go Walmart SuperTech 10w30 Syn.

Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876465
09/23/18 06:44 AM
09/23/18 06:44 AM
Joined: Mar 2013
Posts: 5,206
The Midwest
skyactiv Online content
skyactiv  Online Content

Joined: Mar 2013
Posts: 5,206
The Midwest
Castrol GTX 5W30


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Synthetic for a 30 year old engine? [Re: jongies3] #4876468
09/23/18 06:49 AM
09/23/18 06:49 AM
Joined: Jul 2013
Posts: 2,380
OBX & Central FL
NormanBuntz Online content
NormanBuntz  Online Content

Joined: Jul 2013
Posts: 2,380
OBX & Central FL
Originally Posted by jongies3
Stick with what's worked for the past 30 years!

Yup.


2017 Honda Odyssey SE, 18K
2013 Honda Accord LX, 59K
2007 Honda Ridgeline RTS, 89K
2007 Infiniti M35, 107K
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876491
09/23/18 07:12 AM
09/23/18 07:12 AM
Joined: Nov 2011
Posts: 1,402
Lyndhurst NJ
Audios Online content
Audios  Online Content

Joined: Nov 2011
Posts: 1,402
Lyndhurst NJ
No need for the syn, Im pretty sure even the conventional will have some syn in it. Id go with a VWB or PYB in 10/40 or so to start, maybe try a high mileage like said. Dont over think it! The car ran on conventional for a long time, Im sure its happy with the same stuff going back in.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876519
09/23/18 07:57 AM
09/23/18 07:57 AM
Joined: May 2018
Posts: 650
South Carolina
ka9mnx Offline
ka9mnx  Offline

Joined: May 2018
Posts: 650
South Carolina
I changed to sythetic oil in my: 1993 F150 at 182K (now at 255K), 1997 B2500 Van at 160K (now at 175K) and 2000 4Runner at 245K (now at 250K). No leaks. No problems.


2005 Ranger 3.0 - M1 HM 5w-30/Motorcraft - (85+K)
2000 4Runner 3.4 - M1 HM 10w-30/Toyota - (250+K)
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar - (175+K)
1993 F150 4.9 - M1 HM 10w-30/Motorcraft - (250+K)
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876531
09/23/18 08:15 AM
09/23/18 08:15 AM
Joined: May 2015
Posts: 680
California
SavagePatch Offline
SavagePatch  Offline

Joined: May 2015
Posts: 680
California
Sounds like the compromise to meet in the middle of all the suggestions above would be Maxlife Synblend 10w30. It'd be hard for me not to spend the extra couple of bucks and use the full synthetic version though.

Last edited by SavagePatch; 09/23/18 08:16 AM.
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