[DeTomaso] Oil Numbers

asajay at asajay.com asajay at asajay.com
Wed Jul 1 17:11:56 EDT 2009


Okay, so how do I know what grade of oil to run, if I'm my own builder  
and I don't know the relation between clearances and oil viscosity?

Asa Jay

Quoting Tomas Gunnarsson <guson at home.se>:

> 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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