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Originally Posted by rrgrassi
What about using a "reverse" flush kit from Prestone?
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If you remove the little Tee that they give you to install for the flushing process, OK.
If you leave the Tee in there, you are on your way to disaster!
My brother lost the engine in his Lexus over that stupid thing. What happened was the center of the cap blew out, after about a year and a half. By the time he saw his temp warning light ON it was all over with!

scored cylinder walls and warped head.
I did a search on the internet and found someone else also had the same exact experience! I'll bet there are more than just a few cases like this, as few people are inclined to go and put the info on the Internet, for every one that does there are probably 20 that don't.
So I have to say my opinion of that thing is that it uses cheap parts that are likely to fail and when that happens and the result is most likely your engine will be toast.
Do you want to risk yours???