Originally Posted by BW_WestAust

I've heard this and been wondering, what's the right oil to use then? I'd be grateful if you could recommend an ARO that won't attack the silicon in my FZ-91AC. I just got this mint-in-box, never run or sold before, and that means it must have sat in a box somewhere for at least 10 years. I would also appreciate if anyone could tell me what to expect from that - will the seals/diaphragm deteriorate over time, when the engine has literally never even come out of the original plastic bag? Will it likely be a) OK, normal, fine, no issues b) fine but for reduced time before silicon-based parts need changing, or c) the silicon parts probably need replacing already due to age. Again, I emphasize it's never been sold or run, and definitely nobody's ever put fuel or any type of oil in it, it's literally straight off the shelf as if it were still new stock... it is really, it's just been there all these years. By the way, when exactly did production for these cease and is there anything on the engine, box or documents to tell me when it was manufactured?
Thanks in advance.