In a message dated 98-03-02 04:29:47 EST, hunnam@PNC.COM.AU writes:

> only uses diesel engine oil as lubricant  in his petrol motor.
>  He claims that the detergent factor in the diesel oil
>  helps keep the oil galleries and motor free of sludge
>  and carbon deposits.
 <snip>
>  Any one got any ideas on this.

Yes.  This is crazy!
SAE, API, and the automotive and petroleum industries have spent 100 years
honing oils for specific duties.  Motor oils for gasoline engines have a
different set of challenges than those in a diesel engine.  Appropriately, SAE
has different tests & standards set up for diesel engine lubricants and
gasoline engine lubricants.  Sometimes these overlap, but typically one
lubricant won't excell at both gas and diesel standards.  The 'S' set of
standards (SD, SE, SF...) have defined the standard for Spark (S for spark)
ignition gasoline engines, while 'C' standards (CC, CD...) are set for
Compression (C for compression) ignition diesel engines.
Use the highest (letter furthest along in the alphabet) grade available for
your type of engine.

Regards,
Jim Davis