Celicasaur

Anybody here using Water Wetter in their M156?

I've used it before with a degree of success on a smaller engine. I'm curious to understand if there's anybody here with first-hand experience of it on their 6.2 motor. If anybody reading this has/is using Water Wetter, please could you help me with the following:

1. How many of those little additive bottles did you add to the cooling system?
2. Do you have a genuine idea as to how many degree's the average 'hot' engine temp dropped by? ie, when heatsoaked or after driving like a loon, did your average temp drop from something like....I dunno 220F down to 220F or better?
3. Do you run it all year round?

bhamg

Hey Celica - I've used it for a long time now and am a believer. That said, do not use the regular version with our G05 HOAT coolant. I'm not comfortable with mixing anti-corrosion additives these days given the plethora of different types of coolant. I use the Diesel version which is strictly a surfactant that breaks down air bubbles in the coolant. It's my secret weapon to prevent or minimize pitting and corrosion from cavitation. I do it the easy way, draining the overflow reservoir and adding back coolant and (to start) 2/3 bottle of DWW. After 9-12 months drain out a little coolant and add the remaining 1/3 bottle. I'm not really a believer in the lower coolant temp theory of WW but breaking up air bubbles, hell yeah.

edit: After the initial fill use 1/2 bottle every second year as long as the same coolant is the system

Bahnstormer

+1 on Water Wetter Diesel.
Definitely helps keep engine temps down.

bhamg

C - If you search, there are many forum accounts of lower temps and many of no effect on temps. I haven't really seen a logical "universal" explanation of differing results and I don't worry about it.

Celicasaur

Thanks guys

I'm not sure what coolant I have in my car or if it might be marginally different to yours being from way over here, but I'll have a poke around to work out what it is. It's that bluey one....actually, it's probably the same as yours. Which coolant would I then need to get? Our cars take....8L of coolant?

Also, so I just need to buy one of these?
https://www.opieoils.co.uk/p-1037-re...ve-diesel.aspx

According to the instructions,I thought it was one little ~355ml bottle per litre of coolant in the engine....I'm glad I mis-read that one then. Could have gotten really expensive

skratch77

You guys are fighting an up hill battle.you can try to lower your temps by 50d and the car will still run at 197f.

If you want lower temps get a 180d thermostat

Bahnstormer

​​​​​​It's more than just about the overall temperature of your coolant mixture.
Watter Wetter decreases surface tension inside the engine and allows better heat transference, both from the motor to the water and the water to the radiator.
Because there is less localized boiling (like in the head) where air bubbles form, it helps in eliminating hot spots.
I've used Water Wetter in all my cars with great results and no downside, so for under $20 it's a no-brainer to me.


​​​

Celicasaur

Not a bad suggestion tbh....I just can't be bothered to install a lower temp thermostat, hence an additive sounds appealing.

Screw it, I'll do both. I just want it to remain relatively consistent between ~176 to ~200 at all times.

Can I just pour the bottle into the system and expect even just a few degree's of better cooling? I'm reading online about some people saying it works best as a straight additive to plain ol' water, but that scares me a little with any possible long term effects on the block.

Bahnstormer

I use Water Wetter with around a 60/40 mix of water to coolant.
Just a slight bit more water than coolant to take advantage of the Water Wetter properties.
Make sure you get the Diesel version (harder to find in stores).
I ordered mine online from Amazon.

BLKROKT

Celicasaur

I just ordered the Diesel variant as you guys recommended


Any idea on numbers (rough numbers) in standing traffic and then when hooning around?

bhamg

IMO exactly the right thing to do.

bhamg

The overflow res holds a surprising amount of coolant. You could siphon/drain it all out, replace it with distilled water only, drive for a few weeks like that trying to get the coolant going through a regular hot fluid exchange in the overflow res, then replacing it a second time with distilled water only again and the DWW. That'll provide better cooling but will you see a difference in the numbers, I don't know. I have done that before and the fluid exchange has been surprisingly quicker than I expected, judging by the color. You do want the ratio to tilt in the direction of higher water %.

BLKROKT

Jasonoff

What about MoCOOL?

https://www.motul.com/ca/en-US/products/mocool

Celicasaur

This scares me a little, being a Mercedes and these things loving to break out of the blue and leave owners with a horrid repair bill, but I'll take your word for it and give this method a try. I log all the time nowadays so I've got a very good idea as to what the 'norm' is for my car in particular.

Interesting...so with all of that ( i mean...the fans being on all the time is pretty extreme) it's only a 4 degree difference....and 4 degrees Fahrenheit at that?

See the highway thing would kinda annoy me, as 1) the engine naturally runs cool at speed as you said and 2) being cooler than designed will affect fuel economy and the oil will run cooler than the intended temperature. That being said, I didn't know about the thermostat difference vs you guys, so perhaps you're right - the thermostat is probably how I'll see the biggest difference.

Looking at my logs today on the way home from work, right as I got home, the highest coolant temp was 102 Centigrade / 215 Fahrenheit... Mid 190s would be a much nicer 90c and make me feel more comfortable running such an angry tune up.



Are your figures from the instrument cluster on the dash? My logged coolant values are 9-10 degrees C cooler than what the dashboard says. Assuming yours is as optimistic as mine I should see a significant difference in changing the thermostat....hmm I think I'll go for the USA 188 one instead of the 180...it would irk me lots in this cold country to be cruising on the highway and running the engine too cool.

bhamg

The coolant capacity of the W204 C63 is a largish 12.4 qts. So, nothing to worry about particularly re. the percentages, but I think you might as well just dump it into the res. and get going on it. Utilizing the current 50/50 fill gives you the advantage anyway of an immediate and direct comparison.

Celicasaur

Sounds good - I'll try that.

And then also....I'll log the drive back home again and hit WOT at the same places where I did so yesterday, then I'll calculate an average temperature of the journey to validate whether or not it had any effect or not

bhamg

Celicasaur

I tell you what then... perhaps next week I'll log my drive home from work on the Friday and then the following Friday and compare against my drive home yesterday.

bhamg

I truly think your best bet is to bypass the overflow and introduce it directly to the system. Another wild-*** guess based on visual observation is that perhaps 8-12oz gets exchanged each time the the car gets hot and cools down. I doubt it's more than that. So, it takes a while. That's why when I read that someone says "it didn't do anything" I wonder if they know how much time it'll take for the overflow and system fluids to equalize.

Aditya Prabhu

So is it right to say that if I stay in a country where I don’t see temperatures dropping below 10 deg Celsius and if I drive hard and on the track -

1. 50% distilled water
2. 50% water wetter (not diesel version)

would be the best combination ?

someone mentioned that if we use Airconditioning it’s advisable to have 20% coolant and anti freeze

1. 20% anti freeze
2. 40% distilled water
3. 40% water wetter (non diesel)

any opinions or advice ?

BLKROKT

Don’t put 6 quarts of WW in there. Follow the directions. One bottle treats the full capacity, whether water or coolant mix.

https://www.redlineoil.com/Content/f...ech%20Info.pdf

Aditya Prabhu

Gotcha. Thanks a lot

so it’s -

1. 20% coolant
2. 80% water
3. one bottle water wetter

please don’t go on the math

BLKROKT

Yes. Advise to add the diesel WW if you’re using any coolant.