Pink Super Tech (Walmart) -50 RV and Marine ok for engine?? I always thought NO...??

[crazy charlie]

I have recently seen videos of dudes winterizing Mercruiser engines using what I have ONLY used on my water systems.Pink -50 Super Tech Marine and RV antifreeze. I thought I remembered this being a BIG no on engines. Dont remember exactly why.Charlie

 

[JimS123]

I have recently seen videos of dudes winterizing Mercruiser engines using what I have ONLY used on my water systems.Pink -50 Super Tech Marine and RV antifreeze. I thought I remembered this being a BIG no on engines. Dont remember exactly why.Charlie

They make 2 versions. Both are pink.

One says on the bottle that it's for marine and RV water systems. The other one says it's for engines.

Just READ the instructions.

 

[airshot]

Best to drain the engine of all water, then use antifreeze to flush out any water left inside. Any trapped water will be pushed out or mixed in antifreeze so it won't freeze. By doing rhis, it makes no difference which you use, but the auto stuff does help stop or slow down rust. The pink stuff is better for the enviorment. Whatever you choose be sure it is run out in the spring before launching your boat in the water. Lots of methods used to winterize a boat engine, but this method has worked for me for 60 years.

 

[DeepCMark58A]

I use the auto stuff, it is a rust inhibitor.

 

[Pmt133]

The only one you'd want to avoid leaving in there is one with alcohol in it. As long as it's some version of glycol (PG or EG) with corrosion inhibitors. (Both nontoxic and automotive are corrosive when they don't have an inhibitor)

Leave it dry, leave it filled with AF, purge with AF and drain... it doesn't really matter. I have seen manifold drains rust shut when just purged with air... and tons not. It doesn't matter.

 

[Chris1956]

Both Ethylene Glycol and Propylene Glycol are alcohols, as are all glycols.

 

[Pmt133]

I only wrote it as I did because the ones not reccomended for use in engines will typically list ethanol/ethyl alcohol on the bottle... thus avoid "alcohol". That being said I've seen methanol ones as well and can't help but wonder if it is just washer fluid with a different label...

 

[Jeff J]

The -50 RV/Marine product advertises corrosion protection. It is widely used here. Many boats are winterized on the dock so the non-toxic feature is sought after since any that is spilled goes into the lake.

 

[Lou C]

Always go by the lowest temp expected in your area. If it's zero, then you want -100 because both the -50 and -60 solidify but don't expand at approx zero degrees. I don't want anything that gets solidified in a cast iron engine. -100 stays liquid down to -55*F. I also will mix up my own Sierra PG antifreeze to about -25*F, depending on the price of it, vs the price of the pre-mix -100 (remember that's burst point, not freeze point, freeze point as I said is approx -55*F).