[Diy_efi] Zinc and o2 sensors

[Torbjörn Forsman]

Here in Sweden, it is often said that as far as a gas engine does not 
have abnormal oil consumption (i.e. below 1 % of the fuel consumption), 
then you can use just about any oil without fearing damage to the O2 
sensor or cat. But in case of higher oil consumption, one should avoid 
mineral oils and diesel classified oils. It is then better to use a 
cheap synthetic or semi-synthetic oil. Anyway, an engine with high oil 
consumption will usually not pass the annual emissions inspection, the 
HC contents will be too high.

/Torbj?rn Forsman

David Allen wrote:
>   I have used Rotella exclusively in my 72 Nova (with an EFI engine) and had
> no O2 sensor troubles, and in my turbocharged Century (over 100,000 miles)
> and had no short-lived O2 sensors, and in my mother's 89 LeSabre, (350,000
> miles) with no short-lived O2 sensors and still the original cat.
>   People can say what they want but experience doesn't lie.  Rotella oil
> does not cause problems in a gasoline engine, in fact it is one of the best
> oils around.  It is API rated for use in gas engines.
>   David
> 
>  -----------
> 
> I have heard that using rotella and other diesel engine oils in gasoline
> engines will make the motor last longer because of the higher zinc content.
> I have also heard that this will kill o2 sensors and catalytic converters.
> My application will not have cats but it will have an o2 sensor.  Do any of
> you guys know if this is true or not?  The motor is freshly rebuilt so there
> really wont be any blow by.  Let me know what you guys think.  Thanks -
> Justin
> 
> 
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