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im getting confused reading all of the posts on this topic. My marina said I could use quicksilver 25/40. We are in Buffalo ny. Help. What oil should I use?
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I think most on here would recommend either Valvoline VR1 20w50, or VR1 40w -
GT-40 engines take straight 40w oil . Don’t get so caught up with what other oils boat owners use ; it will only confuse you. Everyone tries to be the expert on what oil to use or wants to lead you to some expensive Designer Oil . Straight 40w is very cheap oil to purchase and I too had a GT-40 engine and ran house branded straight 40w oil for 16 years with no problems.Keep it simple and go to WalMart and buy some straight 40 W oil end of storyComment
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Lol...what he said!Comment
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I will third the above comment. I run house brand straight 30 weight. Manual recommends either or depending on conditions.
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Agreed. Few things are more controversial on this forum than "What oil should I use?" It turns into an endless game of one-up-manship.Comment
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Yeah but when you can buy the VR1 for 4.60 a quart why not.
https://www.amazon.com/Valvoline-20W...gateway&sr=8-2
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Not sure how much of a difference it REALLY makes, but oils have changed quite a bit since the GT-40 was produced. Most oils now don't have the proper amount of zinc for flat tappet engines. That's why so many people here run the VR1. It is still high zinc, and is supposedly better for these older engines. That's what I run.I own and operate Silver Cove Marine, which is an inboard boat restoration, service, and sales facility located in Mooresville, North Carolina. We specializes in Nautiques and Correct Crafts, and also provide general service for Nautiques fifteen years old and older.
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Given your northern location, if your going to be running in 50 degree temps you definitely want to run a multi-grade oil, or make sure you let the boat warm up before running hard.
I used to run Castrol 15/40 GTX Diesel that used to have the needed additives and was SM (automotive engine) approved in my old GT40 block.
But they removed an exemption from an emissions/content perspective that allowed these oils to certify as SM, so your choices are even more limited.
The idea of running the 20/50 weight VR1 always made nervous as I never heard a explanation for why it would be okay to run with a higher viscosity than what the engine is designed for.
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