Sticking on topic i changed from organic to inorganic when i fitted my electric waterpump, the concentrated inirganic had a higher boiling point,(nessesary because i de-pressurised the system) a lower freezing point and better conductivity than the standard organic stuff - ive got to change it every 2 years, though
There is new, very expensive stuff that performs even better available now
Hi i recently cleaned out my radiator with flush and replaced it with antifreeze brought from a ford dealer -37 degree stuff the dilution ratio is 1:1 abd i read that my mk1 tdci focus takes 6ltrs of coolant but the 6 litres has put me over the max mark will ot cause any harm like this?
Generally, it doesn't. The harm it can cause is if the antifreeze boils over (wrong phrase) and spills over the paintwork, because the paintwork can be damaged (or even cause a mist in the engine compartment, which isn't good). If it doesn't spill out, it doesn't cause damage.
I assume its bad when you drain your radiator and rusted water comes out ?
Well, rust has got in there, and, assuming that it wasn't filed up with rusty water, it indicates that something has been rusting, and this is not, generally, good. The corrosion inhibitors ought to stop this, so, probably, the most likely explanation is that the anti-freeze either had the wrong inhibitor or not enough inhibitor.
If putting the nice, new, shiny a/f has stopped this, then you have probably done all you can; if it, relatively quickly, starts going rusty again, then start worrying.
For 10mins of 1.5-2k revs drained and put another bucket through then filled tank with water ran engine for 5 drained and then put the antifreeze in so think i got most of it out
That sounds like you did a good job; the only other caution that I would add is that if you are in a hard water area, you really want to be using distilled/de-ionised/'water filter' water to ensure that you aren't dumping too much hardness into the engine, because the hardness has a habit of dumping out on the hottest part of the engine, which needs the best cooling...and it reduces the cooling.
On a vaguely on topic point, I did once try 'synthetic Propylene Glycol' antifreeze, and one of the difficulties was that garages had a habit of 'helping' (and I mean the exact opposite) by topping it up with the Ethylene Glycol stuff. Of course, if they test the Propylene Glycol with a Specific Gravity tester, they get completely the wrong result, although the refractive index testers work, apparently.
If you are using anything unconventional, you need a big notice on the expansion tank telling them what they have to use, because any excuse and they'll 'help' you so much that your cooling system stops working.