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post #1 of (permalink) Old 05-26-2004, 08:11 AM Thread Starter
 
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Synthetic Oil

What grade synthetic motor oil are you guys running in your Zuks? Almost time for an oil change so I thought I would ask the pros.

[img]images/graemlins/chairfall.gif[/img]
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post #2 of (permalink) Old 05-26-2004, 09:16 AM
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Re: Synthetic Oil

I use 10w-40 Amsoil.... Probably could use one of the 30w multi's as well.....
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post #3 of (permalink) Old 05-26-2004, 09:34 AM
 
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Re: Synthetic Oil

I'm using 15w-50 Mobil 1. Owners manual has a range of 10W-30 to 20W-40 for the
SJ410 1L, and that was the closest I could get in M1. Been running it for 4+ years
and over 55,000 miles, compression has only dropped 5 psi or less in that time with
a total of 150,000 on the clock. Lowest cyl is 177 and the highest is 190, just
checked 'em a couple of weeks ago.
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post #4 of (permalink) Old 05-26-2004, 09:47 PM
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Re: Synthetic Oil

Attaboy.....
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post #5 of (permalink) Old 05-27-2004, 04:04 PM
 
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Re: Synthetic Oil

On the subject of synthetic...

Noticed that Wal-Mart has the store brand full synthetic. Does anyone know who the actual manufacturer is and how does it compare to the national brands? All the same classifications are met.

Thanks, Ray
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post #6 of (permalink) Old 05-27-2004, 04:59 PM
 
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Re: Synthetic Oil

It comes from Warren Distributing. Rumor has it that they were either sold to or bought Coastal.

From another board:

"FYI there has been some controversy over what is synthetic and what is not. Mobile1 is a real synthetic oil, whereas Supertech "100% synthetic" is petroleum oil that has undergone enough chemical changes to be labled as synthetic. In reality it is a hydro-cracked petroleum. Unfortunately the courts have allowed the labeling of hydr-cracked oils as synthetic. Mobile1, Amsoil, Red Line, etc... are truly synthetic fluids from the ground up.
Not to say Supertech is not a quality oil, as I have no direct experience with it. It is only 100% synthetc in the courts opinion - The reality is otherwise."
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post #7 of (permalink) Old 05-27-2004, 08:51 PM
 
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Re: Synthetic Oil

Thanks. Castrol Synthetic is another one of those "SYNTHETICS" right?

I also don't know if it is good or not. The price looked good...

Back to the original question. What is the best weight?
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post #8 of (permalink) Old 05-27-2004, 11:47 PM
 
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Re: Synthetic Oil

I used Mobile one forever and switched to Castrol Syntec..

Nasty stuff, my engine went from Awesome to Rings totally shot after using that [img]images/graemlins/AR15firing.gif[/img].

I have relabled it to Castrated Oil.
which is what it does to your engine, if it had balls to begin with, it won't after that oil is done with your engine.

My opinion, but don't use Castrol anything. Also based on my experience with it.
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post #9 of (permalink) Old 05-28-2004, 12:24 AM
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Re: Synthetic Oil

The synthetic scam:
The reason you change oil is because it gets diluted with gasoline (blow-by etc) gets carbon in it (from combustion,) and gets acidic from the unburned HC and water. Filters cannot get all the carbon out, cannot neutralize the acids, or get the unburned gasoline out (gas destroys the lubricity.)

The supposed idea behind synthetic is you don't change your oil as often (justifies the higher price.) You leave all that stuff in your engine so the carbon can wear your bearings and rings better, and the acids can eat away the bearings at the same time.
Do they care?

The only way to get rid of the carbon, HC, and acids is to dump it out!


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post #10 of (permalink) Old 05-28-2004, 12:12 PM
 
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Re: Synthetic Oil

So you're saying even though a true synthetic oil may have better lubricity (?) leaving the contaminants in at higher concentrations more than cancels it out??? Has anybody been brave enough to do lab testing and publish it?

I remember someone doing a test where they had some NY cabbies change oil every 3000 and others every 6000 and after 50 or 100,000 miles they tore the engines down and could find no appreciable difference....of course it might have been [img]images/graemlins/AR15firing.gif[/img] Consumer Reports.....

My dad drove 50K a year for years and always changed his oil at 6-7K intervals, and used what I thought was cheap oil he got by the gallon...and never had any engine failure of any type. Obviously mostly highway driving but I've always wondered about the almighty 3000 mile oil change [img]images/graemlins/confused.gif[/img]
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