Oil for GSXR-1000 (k4)

[mossy1200]

Cheers for that

Personally I do filter every oil change.
I use the K&N because they have a removal install bolt head on them.

[jonnyk5614]

Repsol Moto Sintetico 10W40 any good?

It is on special at motozone....

[Asher]

If you stick with the well known brands you should be safe and I always use full synthetic oil.
Only buy oils that have the following standards printed on the bottle: API SE, SF or SG. API SH or SJ with JASO MA