I have always had the light load rattle, it improved quite a bit recently when I replaced my injectors but was still quite noticeable. However I just started using 2 stroke oil after reading this thread 2 Stroke oil in D4D
and it has made a massive difference, almost no noise at all now
My oil ratio isnt even that accurate as I chucked in 300ml to somewhere around half a tank (I run the 145L tank). I plan to drop my oil rates over the next few fills until I hear the rattle start to come back then go back to the last noiseless ratio and see how that pans out. Dumping in over 0.5L for a normal tank load just seems like too much to me despite the reccomended 200:1 ratio.