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Topic
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I know it may be beating a dead horse, but I’m having trouble understanding what coolant to use in my new to me 6LYA-STE.
I’ve done research, not a lazy no search question.
The literature from Yanmar is a bit outdated, they recommend Coolant from Havoline or Texaco. The Havoline ELC is now orange. I have read that the red coolant is what is to be used. The Havoline ELC (orange) is silicates and nitrate free OAT.
Delo ELC is red, silica free, but does have nitrates.
In my 4LH, I used the Shellzone ELC, which is red. But looking at some specs, I think this is only low silica and nitrites…idk.
Please sort me out. Without any guidance I believe I am going with the Havoline ELC like the yanmar literature recommends which is orange OAT, no silicates or nitrates.
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Coolant
I have 4LHA-STEs which have the same coolant issues as your 6LYAs.
The key is, and I think this is in the Yanmar spec someplace, is that the coolant have no silicates or phosphates.
I have used Preston Dex-Cool Extended Life coolant for 20 years with no problems. Any brand of Dex-Cool Extended Life should be OK as long as you can find some place on the label that says “silicate and phosphate free”. These are all orange in color.
If you cannot find the “silicate and phosphate free” on the label I would not use it.
I have attached a picture of an older label and a newer label of the Preston Extended Life Dex-Cool coolant.
By the way, I change mine every year. But I also put 500-700 hours per year on the motors.1 user thanked author for this post.
Mack Boring in NJ rep Sam said the Havoline ELC (orange) and Yanmar brand YG30 is acceptable.
I hope this helps others.
D
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