Coil failures are normally just flukes or defects in manufacturing.
I can't say about Bosh coils but there are only about two companies in
the US manufacturing the old type standard coils and they are marketed
under every name.
Borg Warner used Prestolite and filled back orders from Standard
Ignition.
I listed a few reasons for coil failures but I'm sure that there are
other types of causes that I haven't experienced.
Overheating and spewing the oil out is caused by internal shorts.
Cut open an oil coil sometime ............... its educational. Lots of
windings and iron bar etc.

Stan Wilder

On Sun, 28 Apr 2002 03:29:33 +0000 Jfp w/2 wbxs <jfp7@HOTMAIL.COM>
writes:
> Hi List,
>
> I've seen more than one 2.1L ignition coil leak all the internal
> cooling
> oil. The oil residue made a real mess below the top of the coil but
> the
> engine started and ran OK. The internal resistances were in line
> with the
> Bentley test specs. The 3 coils with this failure had been installed
> on two
> 2.1L engines for some time and were not cracked or damaged in any
> way.
> Anyone seen this type of coil failure??????
>
> Regards,        John
>
>
>
> _________________________________________________________________
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>

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