You are correct Sir. The fact that you got a manual is a good sign The last 3 Brevas showed up with the manuals in French 20/50 is what you should be using. They come from the factory with synthetic,but using dino is not going to void your warranty. I use the synthectic , it gets so DAMN HOT !! in the summer down here & sitting in Houston traffic it gives me peace of mind. I've been using synthetics in my 18 wheelers since 87. My 98 Pete with a Cat had 1,300,000 on when I traded it in & only replaced 2 injectors & 1 water pump. The benefits of synthetics have been documented time & time again & it's not something I'm willing to cut corners on. I dont see anybody using non- detergent anymore, but the same kind of people said the same kind of things when detergent oil came out. YMMV