A quick question. Who's heard of Molyslip and what do you think of their stuff?As far as my limited experience goes they make some of the best oils, greases and cutting lubricants you can get. Only thing is, it's impossible to get!
Ive used molyslip cutting oils on stainless steel, they're pretty good, but probably no better than Rocol products, which are much easier to find, find molyslip here
They tarted up the engine additive a few years ago from the black stuff that I had been using for the past 30 years. It's now a nice clear environmentally friendly tree huggy liquid. It might still work much the same but I'm not so sure. Gunk certainly isn't a patch on the mix it was in the 60s.
I wouldn't add it to a modern expensive oil as these have a delicate blend of additives already and any addition would probably do more harm than good.
However I've been very impressed with it in classic cars over the years. They can certainly run smoother and cooler so it's doing something to reduce friction.
I've stuck it in several boat engines with good results, one owner claiming a 20% increase in range. Mind you pleasure boat engines do tend to get rather neglected so there is more scope for improvement.
I've used the gearbox additive they do for a number of years and am yet to be let down by it. I've had quite a few occasions where customers don't want to or can't spend out on stripping and diagnosing a noisy box or diff where a dose of molyslip has done the trick. Not as good as a repair obviously but if you've got a customer who's reliant on a car that's worth less than a stripdown/repair would cost it makes good short term sense.