Synthetic Oil vs conventional oil?

Opinions?
OK to use in my 71 Buick?

<img src="http://images.scottfisher.multiply.com/image/39/photos/3/600x600/7/Scotts-1971-Buick-Gran-Sport.jpg?et=aLIxvS5UvIpGpwdZUhoaSQ&nmid=128721847" width="700" align="center">

 

I've always used synthetic oil in my car since buying it. As my seals are all original (except the tranny seal which I replaced) and the car sits during the week and only has 45,000 original miles, I do have some oil seepage but I still like using the synthetic.

 

My old 425 does run smoother with the synthetic, lifters are quieter. But there is more noticable leaking. As expected, but worth it
Gary:TU:

 

try a mix or a blend of oil.

 

I wasnt sure you could mix the 2 different types. What ratio do you recommend. For future reference:beers2:

 

theirs always the bs you hear.. saying you cant mix nor cant switch back or fourth....but the simple fact is you can as the oil companies are required to make all oil compatible
hell..i evben mixed vislosities lol 5w30 and 10w30..
10w30 worked well inmy car, 10w40 i'm sure is the most popular

 

I'm not sure, but I also have been adding some Lucas oil stabilizer.
I was told by a mechanic friend to use Lucas.

So the engine has just been rebuilt over the summer.
At first I used regular oil, changed it out @ around 500 miles, and just blended both synthetic and regular 10W30. As I mentioned Lucas added.

I now have just over 1000 miles on it. It has been running like a charm, except my passenger side rear bearing and seal went out.
This problem has been fixed as I am sure it was the original bearing and seal, not bad since 1971!

The problem I am sure was due to the car sitting around for a few years here.

Thanks,
Scott

 

I'm not sure I'd be mixing them. I know they can be mixed, but the benefits of synthetic - resistance to moisture, acidity, and their lack of paraffins, etc., are compromised with organic oil. Plus, their additive packages are diluted, reducing the benefits of their detergents, anti-sludging, etc. Just find the viscosity you need and run full synthetic.

 

I have to agree that a blend really isn't appealing unless cost is a factor.

I don't think there's anything negative about a blend other than it diminishes the advantages synthetic can offer as it becomes more diluted with dead dinosaur goo.

Devon

 

Other note: V8TV is cool.
I passed the link on to an associate.

 

Scott, if you have a few minutes you'll like this article too:

http://micapeak.com/info/oiled.html

Devon

 

Devon,

I'm printing it out as I write. Better to read on paper....

Thanks,
Scott

 

YESSS. The same goes for the "blended" or semi-synthetic oils.
Either go all synthetic or forget it. There is no harm in blending the oils, you just don't get the "full synthetic" benefits.

Personally, IF synthetic is prone to leak, I'd rather have a little leak than have "oil coking" on my 86 GN's turbo bearings.

Simply put, if conventional oil gets too hot (even on accident) , it's going to leave a mark.

ElectraJim

 

So what is your opinion on Lucas Stabilizer additive?
Or; Slick 50?

I understand that the "50" in Slick "50" means Good for 50k?

Thanks,

 

Are you kidding?
http://skepdic.com/slick50.html

Blue Corral, the manufacturers of the Slick 50 engine oil additive, have been banned by the Federal Trade Commission from making claims about reduced engine wear, increased fuel economy and lower running temperatures in it's advertising in America. The Federal Commission found the company's claims of increased performance and reduced wear were unsubstantiated, and Blue Corral has agreed to pay upwards of $20M in damages to affected customers.
Source: Max Power magazine, March 1998.

The 50 means, you could pay me $50K to use Slick 50 in my engine. Otherwise, forget it. :idea2:

About Lucas oil additive, my machine shop recommends it, and I use it.

Wacha gonna use now?!?

ElectraJim

 

I have no direct experience with oil additives whatsoever, the reasons are due to skepticism, study and listening. I don't use it now and have not in the past.

I'm going to change that before the next fire-up because I have to break in a new cam this coming spring. I'm not happy with the zinc levels in the oils off the shelf, and will use ZDDPlus to help with break-in. Probably will use it afterwards as well, until I learn more about what's up with high pressure synth oil qualities versus zinc dialkyldithiophosphates.

I used to brag about not having any cam lobe failures; I can't anymore, having wiped one earlier this year...and it wasn't the same valve that suffered the broken rocker arm, either.

Devon

 

Mobil 1 period End of discussion.

 

End of discussion? Here? :laugh: :laugh: :laugh: