My take on the synthetic oil debate is that if 
your engine has the Viton seals at both ends of 
the crankshaft/  They are brown and the old style 
ones are black I think.  Viton seals handle the 
synthetic oil a lot better than the old school 
seals,so if your motor has been rebuilt by a 
reputable builder or you know for sure you have 
brown seals in there, I'd say synthetic would do 
just fine.  ONe thing is for sure, you don't want 
$7/qt oil leaking out of places that area real bear to replace.....

YMMV

DM&FS

At 07:15 PM 4/13/2011, Chris S wrote:
>I switched to fully synthetic in several WBX engines with 124k, 165k
>and 90k miles. I use 15w50 Mobil, which has been working out quite well.
>
>Chris.
>
>Wysłane z iPhone'a
>
>Dnia Apr 13, 2011 o godz. 18:17 Phil <mypactor@PACBELL.NET> napisał(a):
>
>>I have an '89 Wolfie with 73,000 miles on it.  Would there be a
>>problem if I
>>used, say, Mobil 1?
>>
>>
>>
>>I use Castrol 20-50 in it now and have had no problems
>>
>>
>>
>>Thanks, Phil in Bakersfield, CA