15W-40 in a 78 F-150

Joined
Oct 14, 2014
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1
Location
Wyoming
I have been using Rotella 15W-40 in my 1978 351M pickup for a while now and was wondering if anyone else dose this or uses a better oil for an old pickup?
 
Joined
Jul 24, 2011
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1,473
Location
Missouri
That's I would use in a truck from that era. My buddy runs 15w40 HDEO in his 77 F250 with a 460.
 
Joined
Mar 21, 2005
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Elderly County, Florida
Welcome to the forum!!! I use 15W40 in a number of vehicles I have and have been very pleased with the results. I noticed however, that you live in Wyoming. (My wife is from Wyoming - a little town called "Manville"). As I recall, it gets pretty cold out there so you might have some starting problems when the weather turns sub-zero.
 
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Dec 9, 2004
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Dayton,Ohio
You have no worries, I use Service Pro 15W-40 here in all the shop vechicles with Zero issues. Very LONG life of all engines that i use it in.
 
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Aug 20, 2003
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NE,Ohio
once you start getting to the 20's regularly I'd switch to a 5w40 if you get anywhere near/below 0F you wont be happy with 15w40 in an unheated location.
 
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Oct 3, 2014
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NoVA
I run 4Qts of 15w40 in my 73 Chevy and 1 Qt of High mileage just fine. I don't drive in the winter, is a sports car not a truck. 15w40 is a good oil for older cars/trucks. QS 10w30 high mileage is also a older style oil with higher Zinc than current auto oils that would work well if it gets colder where you live.
 
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