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Kels,
The 10-40 should be OK. Does the engine hold good oil pressure??
Does it get cold where you are?? Or very hot??
I prefer synthetic oil myself..Amsoil to be exact. Alittle pricey, but great stuff. I run it in everything I own and change it at 10,000 miles.
I run 10-40 and live in FL.
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Dave
2005 F150 SuperCrew "King Ranch"
2004 Thunderbird
1997 Ranger
1986 LTD II
1968 Cougar
1964 Corvair Monza
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