The Ford Barn

19Fordy · 05-31-2017, 10:00 AM

Many outboard stern drive marine engines use GL-4 gear oil in their lower unit. It's suppose to be changed every season due to the harsh underwater environment. But, cars wouldn't have the problem.
I wonder if it would be ok for our old Fords. It does not attack yellow metals.
Any thoughts?
http://www.amsoil.com/shop/by-produc...ine-gear-lube/

jimvette59 · 05-31-2017, 10:11 AM

I think it's the non foaming properties that matters in both outboard motors and transmissions. JMHO

50fordcoupeman · 05-31-2017, 10:47 AM

I change the lower unit oil in my Volvo-Penta every season regardless of hours. Manual says to use "30wt engine oil". But in my avatar synchro tranny I use GL-4. If there is ANY question, why take the chance with GL-5? It certainly isn't cost..........

05-31-2017, 10:00 AM	#41
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,919	Re: GL-5 no no Many outboard stern drive marine engines use GL-4 gear oil in their lower unit. It's suppose to be changed every season due to the harsh underwater environment. But, cars wouldn't have the problem. I wonder if it would be ok for our old Fords. It does not attack yellow metals. Any thoughts? http://www.amsoil.com/shop/by-produc...ine-gear-lube/

05-31-2017, 10:11 AM	#42
jimvette59 Senior Member Join Date: Jun 2010 Location: Perry OH Posts: 1,328	Re: GL-5 no no I think it's the non foaming properties that matters in both outboard motors and transmissions. JMHO

05-31-2017, 10:47 AM	#43
50fordcoupeman Senior Member Join Date: Mar 2016 Location: LaGrande Oregon Posts: 865	Re: GL-5 no no I change the lower unit oil in my Volvo-Penta every season regardless of hours. Manual says to use "30wt engine oil". But in my avatar synchro tranny I use GL-4. If there is ANY question, why take the chance with GL-5? It certainly isn't cost..........

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