Will Evans NPG+ coolant help with a slight internal engine leak?

Sealants are a waste of time and money, do it once, do it right, fix the head properly.

Mark (mhpautos)

I have done a bit of research on this product, I am not sold on the idea, as you say you have a leak, I am presuming it is a coolant leak you are refering to, so I am thinking that you expect this product to act as a sealant for this leak, and I feel that it will not. Any leak be it coolant or oil must be repaired correctly otherwise you are just putting off the inevitable and with the risk of higher repair cost as with any leak, the problem can only get worst not better with time, so for my money 9and your donation) I would not be using this product if you have any internal leak issue, as for the validity of there claims, I do not know and I can't comment on that as I do not have enough information that convinces me otherwise, the cooling system was designed for a water based coolant, and that has done me fine for over 40 years, look after the cooling system correctly and it will not let you down.

Mark (mhpautos)

Basically if you want to try this product give it a go, but do not expect it to fix the internal leak you have thats all, fix that first and give it a try, I would be keen to know what you think of it as a replacement coolant.

Mark (mhpautos)

Ok, I would like to make one further comment in this, Although in theory it sounds fine, a coolant that can't over heat sounds attractive, but on the other hand, you must consider a cooling system that can't over heat may mask other problems such as head gasket issues, as head gaskets fail, coolant is drawn into the cylinder and exhaust gasses are injected into the cooling system, this can often be seen by an increase in coolant temp, now I am not aware how this coolant reacts with conventional bulb type heat sensors, do you still get conventional temp readings? Will the extreme boiling point hide potential issues? On of the key diagionstic tools for head problems is the head check, it is a very reliable chemical test for Co in the cooling system, will this new coolant still be able to accept such tests? But maybe the pros may out weigh the cons, I a just not sure, I would do a lot of homework on this if I was considering using it, trouble is I am of the old school, I have been in this industry fixing engine & cars for over 37 years, and some times it IS a bit hard to teach an old dog new tricks. Good luck with it.

Mark (mhpautos)

You may be misinterpreting the benefits of this stuff. You car WILL run hotter ANYWAY with this stuff, just not boil over. Extra heat is hard on an engine.
If you look at the numbers on the Evans website then the heat capacity of their product is only two thirds that of plain water, and still falls around 25% short of the value for water plus conventional antifreeze. This means that you would need to up the flow rate by 25% just to break even, and see no temperature difference. And that is assuming that the radiator as it stands can dissipate the heat from a larger volume of liquid going through it. Like they say, something for nothing does not exist?

There is another product to consider, called engine ice. But actually what is happening with your car? Is it boiling over from loss of coolant? I had a tempo that in the summer would overheat in hot weather pretty easily so I removed the thermostat and it stayed cool on the hottest days!

Do you do your own head gaskets? Or do you suspect head is cracked? A quick and dirty way to shave head flat is to use WD and sand paper on something fairly flat like marble slab or plate glass or formica top or whatever you come up with. I have a 3x3x14 piece of square steel stock that I wrap with sandpaper to shave heads quick.

I know what you mean. Sometimes it's better/more practical to move on then keep ol betsy goin.