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I used a bottle of this after my recent top end rebuild and can honestly say is was well worth the £8 it cost and highly recommend it !

Its a simple flush procedure, but the difference is with this fluid is that it is CLEAR like water when you put it in...............so you can see exactly what effect it has had when you drain it.
Mine was a mid-brown colour with quite a few loose bits and flakes in it when drained, so it definitely did a good job.
Bought it on Ebay.

Pete F
UK

Good call Pete. As you know my 13's been laid up for 5 years & I put in the coolant about 10 years ago. Drained it out last week & it came out a similar colour, a murky brown. I flushed it through with water until it ran clear & ran it up with plain water in then drained it down before putting in ethylene glycol mixed with distilled water. But I have used a flushing agent previously & it's recommended.