moly slip oil additive

[redgriff500]

I put good (but not the best) oil into my 140k Sprinter van and the tappits began making a noise after 1000 miles...

one £5 tin of STP additive and they stopped, cheaper and easier than changing the oil (which may or may not have worked)

Again I wouldn't put them in a low mileage or high tech engine but they seem to work in older ones.

[planetdave]

Globulator said:

In fact Du-Pont knew it was rubbish too, and had to be forced to sell it to them.
One reason it doesn't work is - PTFE DOES NOT STICK.

A couple of thoughts also worth bearing in mind are:
a) If PTFE was a better bearing material, the manufacturers would use PTFE bearings.
b) Plain bearings MAKE NO PHYSICAL CONTACT. It is OIL FILM technology. Doh!!

Sorry to rain on this parade but PTFE WILL stick.

You got a non-stick frying pan? That's a PTFE coating. How do you make a non-stick coating stick? You bake it on.

It's a plastic. If you have a frying pan you will know not to use metal implements on it coz it's not tough and thus NBG for use as a bearing.

Just to introduce one of my famous tangents..........A few years ago I asked an eminent scientist about how to make a 'wetter water' (it was bloody expensive then). He thought you could make an equivalent using a clay. Interesting.

[Globulator]

planetdave said:

How do you make a non-stick coating stick? You bake it on.

Discovered in 1938, PTFE was only used on cookware 20 years later when a way to bond it to aluminium was discovered.

The manufacture and application of PTFE in emulsion form to metal surfaces requires a powerful surfactant: perfluorooctanoic acid, PFOA.

I.e. conditions quite unlike the insides of a car engine!!
Therefore: It will not stick.

planetdave said:

A few years ago I asked an eminent scientist about how to make a 'wetter water' (it was bloody expensive then). He thought you could make an equivalent using a clay. Interesting.

Surely any detergent will do this - or am I missing something?

[planetdave]

Missing something?

Pans are 'easy' to coat. You can see why PTFE could be considered a good lubricant but making it stick is another matter. Engine? Stick? Maybe if you could find a substance that attracts oils at one and and has metal affinity at the other..........

The clay thing.....antifreeze has lots of alcohols which will lower the surface tensions but don't do as well as 'wetter water'. What kind of twisted mind could come up with a physical solution to the problem when everyone else seems to be thinking chemical. And the guy was an organic chemist (specialising in tyre rubbers). It just appeals to me.

[Hammerwerfer]

A good friend of mine works for a company that packages and sells this snake oil. The test rigs are impressive and all the snake oil people use them to good effect at trade shows.

What complte and utter tripe the advertising is though! Talk about bonding molecularly with the metals and filling voids betweeen atomas and the like! Utter nonsense!

[Headbanger]

I have proved to my satisfaction that molyslip does what it says on the box - no more no less with manually set idle speed it added 300rpm (ie reduced friction, possibly more obvious on a big engine) & reduced noise. I'm sure it is quite possible there are downsides but I haven't encountered them. I would agree good modern oils don't need it but that's missing the point - is it advantageous - you pays your money & take your pick. Looking across various forums on the the subject there's the usual assortment of sense, ignorance and twaddle. For those spouting the latter try starting off reading the spec sheet. Not directed at anyone here :-)
As an afterthought interesting to check against ZDDP

Edited by Headbanger on Thursday 16th March 09:32