Depends on the application and your climate... I prefer a 5w-40 Synthetic for close tolerance engines.
It is generally better to wait till you have about 10K on R259 BMW engines before switching to synthetic.
Shell Rotella is very good oil..
here is all the info and opinions you could ask for.
http://www.shellusserver.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=3452&page=1
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Bill Swartzwelder
2002 R1100S Prep/2006 BMW R1200GS
1969 BSA StarFire
Last edited by wswartzwel; 07-06-2007 at 10:08 AM..
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