Anyone using Prestone coolant? 
Saw this in Tesco today and it says it is compatible with all makes of car and can be safely mixed with any type of coolant in the system. 
Not only that, but if you flush the system before filling it is valid for 10 years protection.   Price wise it seems very low cost at £10.50 for 4L if you have a club card.
I’ve done a bit of searching and it seems to be an OAT based product so should be fine in a K series engine.  
I am currently in the process of changing my coolant and if I could find a way to do a system flush to get rid of my residual red stuff left in the block after I undo the underfloor pipes for draining I might consider using it. 
Anyone have experience of using this product and was it a good, bad or indifferent experience? 
Nigel

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