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Synthetic for a 30 year old engine? #4876372 09/23/18 01:02 AM
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geissjr Offline OP
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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 01:06 AM
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Bailes1992 Offline
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You'll be fine. Maybe look at a high mileage oil or using an additive with seal conditioners just incase.


17 Volvo V40 D3 Geartronic - Castrol Edge 5w30 LL & Comma MVATF Plus
96 Defender 300TDi - Castrol Vecton 10w40 & 75w90 Universal
03 Ford Mondeo ST 3.0 V6 - Castrol Magnatec 10w40 & 75w90 Universal
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876374 09/23/18 01:11 AM
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CT8 Offline
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Why?


2015 F150 2.7
2018 F350 6.2
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876384 09/23/18 01:52 AM
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FordCapriDriver Offline
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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 01:53 AM.

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

Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876385 09/23/18 01:56 AM
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Nick1994 Online Content
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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 102k STP Synthetic HM 10w30 & OEM
2000 Toyota Camry 2.2L 234k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 149k Mobil 1 HM 10w40 & Fram Ultra
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876396 09/23/18 03:00 AM
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jongies3 Offline
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Stick with what's worked for the past 30 years!


2004 Toyota Tacoma 3.4 V6: Mobil 1 AFE 0W-30, FRAM PH3614 filter
2003 Buick Park Avenue Ultra S/C 3.8 V6: PYB 5W-30, FRAM PH3387 filter
2013 Honda 400EX ATV: Mobil 1 Racing 4t 10W-40, OEM filter
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876409 09/23/18 04:12 AM
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Dave9 Offline
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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 04:23 AM
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Char Baby Offline
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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 1.8 LX
Re: Synthetic for a 30 year old engine? [Re: Dave9] #4876419 09/23/18 05:00 AM
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Bailes1992 Offline
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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.


17 Volvo V40 D3 Geartronic - Castrol Edge 5w30 LL & Comma MVATF Plus
96 Defender 300TDi - Castrol Vecton 10w40 & 75w90 Universal
03 Ford Mondeo ST 3.0 V6 - Castrol Magnatec 10w40 & 75w90 Universal
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876431 09/23/18 06:16 AM
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Speak2Mountain Offline
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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 07:44 AM
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skyactiv Offline
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Castrol GTX 5W30


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
2018 Elantra Sport 6 speed manual


Re: Synthetic for a 30 year old engine? [Re: jongies3] #4876468 09/23/18 07:49 AM
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NormanBuntz Offline
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Originally Posted by jongies3
Stick with what's worked for the past 30 years!

Yup.


Firesign Theater: "Heavy on the 30 weight, Mom."
2013 Honda Accord LX, 61K, 2nd owner
2007 Honda Ridgeline RTS, 92K, 1st owner
2007 Infiniti M35, 114K, 1st owner
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876491 09/23/18 08:12 AM
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Audios Offline
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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-T5 10/30
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 08:57 AM
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ka9mnx Offline
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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 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Synthetic for a 30 year old engine? [Re: geissjr] #4876531 09/23/18 09:15 AM
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SavagePatch Offline
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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 09:16 AM.
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