Synthetic oil in a 67 BB

[ZRGator]

I know this may have been discussed before, but I guess I missed it. I have a 67 427/400 a/c car with 58,700 miles on the clock and I just gotta know, what are your thoughts on going to Mobil One like I have in my ZR1?

Give me the good, the bad and the ugly, guys. Cause like the bank robber in the opening scene of "Dirty Harry'...."I gots to know"

 

[Vettefan87]

Do not do it unless your motor has been rebuilt and had different gaskets and what not put in. Synthetic oils will destroy practically any motor pre 1982 or so. Do now use any synthetic in your 67. If I were you I would just use like Castrowl 10w30 or 10w40.

 

[00fxd]

I don't understand how synthetic oil will destroy a pre '82 engine??
I agree that you may notice some aditional seepage. Some minor additional cleaning is a small price to pay for vastly superior protection

 

[Vettefan87]

I worded it poorly my bad. It will destroy the seals not the motor, sorry.

 

[1KULC7]

I think the best oil is the oil recommended back in 1967 for the car.

 

[74bigblock]

The gasket/seal technology was different in those days. Take the rear main seal in a 66 327... it is some sort of rope dipped in wax! Do you think a synthetic oil would work well with wax? It would seep right around it. I can't say the same for your 67 BB but I'd be inclined to just run reg 10/30. I am runnning Pensoil regular ole 10/30 in my BB. It

 

[ZRGator]

The gasket/seal technology was different in those days. Take the rear main seal in a 66 327... it is some sort of rope dipped in wax! Do you think a synthetic oil would work well with wax? It would seep right around it. I can't say the same for your 67 BB but I'd be inclined to just run reg 10/30. I am runnning Pensoil regular ole 10/30 in my BB. It....

It what? Tell me the rest, please.:confused

 

[74bigblock]

It what? Tell me the rest, please.:confused

it..... runs great... no probs or wear. I'd stick with the regular... it won't hurt. I typically change the oil in the spring and fall. I put maybe 2K miles on a year. Change often, make sure you have a good filter. You are golden.

 

[00fxd]

A rope type rr main seal in a 327?? Just a second here. I need to hear that from someone else because I don't belive it. I've been wrong before.
The oils available to day are far superior to the oils avail in '67, but synthetic is a bunch better again. Your gaskets and seals will be fine. If it leaks a little now it may leak a little more with synthetic because it is slipperier. No big deal.
Many people like the 15w40 deisel oils to it superior additive pkg, but I like syn becuase it flows better at cold start up where the majority of engine wear occurs.
I am not an engineer, but for me, the purpose of oil is to be slippery. When an engine is new you should break it in with regular oil because syn is TOO SLIPPERY for rings to seat. Hmmmm. Pretty slippery. On some engines I have heard that have changed to syn have to turn down the engine idle speed 'cause it is slipperier than what was in there. Hmmmmmm.
I'm sold.

 

[Ken Anderson]

Syn in an old car is a waste of money and it will LEAK! Guaranteed. For a modern car it's factory fill on the Y cars since 90 and the rings seat in about 30 seconds. Rope rear main seals were not used after '61, I think but definitely not on a '66. The purpose of oil is to bond in a film to prevent metal to metal contact. Slippery has nothing to do with it. I think you mean lubricity.

 

[Vettefan87]

Your gaskets and seals will be fine

Where is Hib when you need him. You can put synthetic oil in it, but do you want to rebuild your motor? I think not, do not run synthetic oils

 

[Vette66AirCoupe]

I switched to Mobil-1 and a Mobil-1 filter two oil changes and one year ago in my '66 BB. I have not seen any leaks other than some slight seepage at the rear main seal. That's no surprise to anybody that's ever owned a Chevy. I keep my eye on it pretty closely as I have a Backyard Buddy and I'm aware of ANY drip of ANYTHING that comes out of my cars because I keep my drip pans wiped clean. My experience says this gasket and seal eating story is an urban legend but hey, maybe I'm just lucky. I just put it in my '60 when I put it to bed for the winter too. I sleep better at night knowing my cars have superior protection.

 

[Vettefan87]

Okay I though Hib stated that it should not really be done, I guess I was wrong on that part. http://www.corvetteactioncenter.com/forums/showthread.php?t=63730&highlight=synthetic+oil

 

[00fxd]

Yes recently syn comes in the crankcases of many cars but in the 90's porche, mercedes, corvettes, caddilacs etc came with fossil oil and recommended to change to syn at the first oil change.
As I stated earlier, I am not an engineer. Too slippery to seat rings works for me. There's no way it will eat gaskets or seals. There's lots of old wifes tails out there. For years the rumor was you couldn't run syn in Harleys because the crank bearings are rollers. It would make 'em slide . I used it for years in mine and Harley Davidson has now gone to all synthetic lubes.

 

[Vettefan87]

If it was my car I just wouldn't. That is just my opinion. I would just run like Castrol 10w40.

 

[ZRGator]

There's lots of old wifes tails out there. .

Is this a Freudian slip, or what?

 

[00fxd]

Old ones, young ones, they're all out there.