[DeTomaso] Oil Numbers

[Tomas Gunnarsson]

I'd say no change at all. The viscosity is measured the same way with mineral and synthetic oils AFAIK. If your engine builder says use a 20W50 I see no reason why you shouldn't be able to use a mineral 20W50 or a synthetic XXW50 oil. Or the other way around, you build an engine the same way for a mineral or synthetic oil of a given (hot) viscosity.

My 2c...
Tomas

----- Original Message ----- 
From: <asajay at asajay.com>
To: <detomaso at realbig.com>
Sent: Wednesday, July 01, 2009 10:37 PM
Subject: Re: [DeTomaso] Oil Numbers


> Which brings up an interesting question.  For those of us hicks who  
> tend to build our -own- engines.... how do I know what oil is best to  
> use with what clearances?  If rebuild an engine to factory specs  
> (clearances), then I would assume the factory recommended oil.
> 
> But, what if I want to run a synthetic?  How does that change the  
> clearances influencing oil grades?
> 
> I'm dumb on these things... that's why I ask all the questions.  :)
> 
> Asa Jay
> 
> Quoting JDeRyke at aol.com:
> 
>> In a message dated 7/1/09 9:46:32 AM, teampantera at yahoo.com writes:
>>
>>> I think the time to discuss engine clearances and what oil to use with
>>> your engine builder is BEFORE you put oil in a new   
>>> engine....especially if he
>>> is providing an engine warranty....
>>>
>> Absolutely correct. For example, an engine clearanced for 5W20 synthetic is
>> not going to last long with 20W50 dino oil, and the other way around won't
>> work either. Go with the builder's recommendation. No one else knows exactly
>> what's in your engine- and if he doesn't have a specific recommendation,
>> find another engine builder.   My 2¢- J Deryke
>>
>>
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