What oil are using?

[bhazard]

I run penzoil platinum 5w-20.

[BigWheel]

Several of you guys are running synthetic oils and I've heard mixed reviews. The one most prevalent is the one that says the engines of these older cars were not intended to run with synthetic oils and can cause major problems. Has anyone else heard that and is that truely a myth?

[Jasin]

Years ago engine manufacturers recommended non-detergent oils for engine break-in, when "square-faced" cast iron rings needed to "seat" into the engines. This is no longer the case and now engine manufacturer's no longer recommend the use of non-detergent oils. Maybe thats where it came from.
I think just about ANY oil you buy today is gonna have high levels of detergents and dispersants. Let me know if you find any that don't, just wondering.

What major problems did "they" say would happen exactly?
Fact:Synthetic oils DO NOT, I repeat DO NOT, cause oil leaks. Deteriorated and hardened seals and gasket material cause engine oil leaks.

Myth:Using synthetic motor oil will void a manufacturer's warranty.
However, one exception would be the Rotary (Wankel) engine in certain Mazda vehicles....
Dear John,

Thank you for contacting Mazda North American Operations. I appreciate
the opportunity to respond to you.

In regard to your inquiry, Mazda recommends using 5W-20 engine oil for
the Mazda RX-8. Please understand, Mazda hasn't done any long-term
testing using synthetic oil with the RENESIS rotary engine. As such,
we don't recommend the use of synthetic oil.

Regards,

Lisa Lasky
Specialist, Customer Assistance E-Business

[stefan]

5-30... usually quakerstate

[BigWheel]

What major problems did "they" say would happen exactly? Fact:Synthetic oils DO NOT, I repeat DO NOT, cause oil leaks. Deteriorated and hardened seals and gasket material cause engine oil leaks.

You hit the nail on the head...major leaks, wear & tear on gaskets and any non metal parts. To me it all sounded like a bunch of bull because every car made has "non-metal" parts but most myths start with a little truth somewhere. This one though just seemed to make no sense but thought I'd ask before doing something I'd regret.

[elcamino1]

Several of you guys are running synthetic oils and I've heard mixed reviews. The one most prevalent is the one that says the engines of these older cars were not intended to run with synthetic oils and can cause major problems. Has anyone else heard that and is that truely a myth?

How old are you talking about?
I've been using Synthetic oils for over 20years!
And I never had any of those problems!

[hawkdoc60]

I prefer Havoline 10W30, but I use Castrol if necessary.

[gottafesty]

NAPA 10W30. No reason except we have a NAPA here.

[CHills]

I just fill the gas tank with 2 Stroke and don't worry about putting in oil. (Kill two birds with one stone, know what I'm sayin')

[FB71]

(Kill two birds with one stone, know what I'm sayin')

two birds, all the mosquitos in a 1 mile radius, and anything else that may have been alive!!!

Let's all buy Trabants and early Saabs, and have a "Blue Haze Across America Tour"!!!

[packrat427]

Pennz 10w30 in everything except the Hot Rod , it gets Castrol Syntec Full syn 5w50 .

[packrat427]

two birds, all the mosquitos in a 1 mile radius, and anything else that may have been alive!!!

have a "Blue Haze Across America Tour"!!!

LOL Blue Haze baby !!

[FB71]

dude, I still want to ride that!!!

oh, and we have run castor oil onour tour!!! Nothing like the smell of castor oil!!

[deathegg]

Let's all buy Trabants and early Saabs, and have a "Blue Haze Across America Tour"!!!

That's probably a little easier than what I was thinking about.....smokey old GE U-Boats or Alco's! (I'm pretty sure you know what I'm talking about Jim, but I guess most people don't).