Saving Old Seagulls

Is it ok to use a small amount of Molyslip in with the oil in G/Box on 40Plus Seagull? Would have thought it would give that little bit of extra protection.Also before changing oil completely would a complete flush out prior to changing be an advantage? If so what would be suitable to flush with?

Don't think there is any advantage in using Molyslip in what is a fairly crude gearbox. Council of perfection (depending on the state of the gear oil now), would be to take off the end cap, clean out the gloop, re-fit and refill, but if the oil ain't too bad - perhaps a coffee coloured emulsion, I tend to make up the level with any oil, run the engine for a while, drain (probably overnight) and refill with good stuff. Rick

Thanks again Rick for comment re additive. I have been an engineer for 34 years and tend to be a bit neurotic regarding lubrication issues with any engines including cars. Better this way I suppose than risk a dry gearbox.
Barrie