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Loaded question alert, eh? Kind of like asking a room full of Chevy/Ford/Dodge guys what the best truck is, them's fighting words.
The best answer won't really answer your specific question, but anyway... use the API and SAE specification oil that is called for in your owners manual. A general answer depending on where you live is to use SAE 5W30 to maybe 20W50 weight oil With an API rating of I think now adays it should be SG or higher. I think engines from your year were Ok with API SE or SF or higher but don't take my word. BTW there are lots of oil websites with excellent info.
My personal preference is a synthetic in general and Mobil 1 or Valvoline Syntec in particular. I also use Texaco Havoline Synthetic. For Dino my preference is Valvoline. I do not change brands of oil in any of my engines once I start using it, and I do not mix brands or grades/weights. Maybe just personal quirks.
In general most magazine articles say all the name brand oils that meet the appropriate API and SAE spec will work fine with regular oil changes.
Oil is oil. As long as it is API rated and is the right grade and viscosity it meets the same standards. Anyone saying otherwise has bought into the advertising hype. But hey, if you like to spend more money on the name brand stuff,more power to you. I buy whatever is on sale. Change it at 3 to 5 k and a new filter, and your engine will go a long way. I remember Consumer reports concluded the same thing a few years back when they tested different oils and change intervals on an identical fleet of taxis. No detectable difference when the engines were torn down and measured for wear.
You Write >>
I remember Consumer reports concluded the same thing a few years back when they tested different oils and change intervals on an identical fleet of taxis. <<<
Mabe Ken could talk/fenagle or what ever, some one into donating Many cases of oil to the fine FTE members for an " F T E Certified" rateing
__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
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72 F-250
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http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
Matt, the best oil is Mobil 1 synthetic, with the other synthetics very close behind. Most of the dino oils are also very good, but I wouldn't ever use any Quaker State or Pennzoil. I have taken apart engines that were run on these and they are full, and I mean FULL of a waxy buildup that the other oils don't seeem to cause. DF
I'll second that DF, I see how pennzoil @ Quaker State look after 5000 miles compared to valvoline. It's not pretty. Working at a lube rack part time I get to see this a lot.
I use Valvoline in all my vechicles and small engines. In the truck I run straight 30 weight in the spring, summer, and fall. In the winter I use 10w30. I put about 3000-4000 miles on the truck a year and change oil at least 3 times. Expensive but I think it is good practice for a happy engine.
Just my two cents worth. I quit using Quaker State in 1972 when it seemed like there was always some kind of sediment/water in the last bit that came out of the can. (Remember cans?) I've been using Havoline ever since, except Castrol in my boats and motorcycles. Always have changed the oil and filter at 3K-5K. Have NEVER had an oil related or lubrication related problem with an engine. Last truck I traded for my current one was a '95 Z-71 5.7L It had 116,000 mi and still did not use a quart between changes unless I had pulled my gooseneck horse trailer a whole lot during that interval. (Up to 14,000 lbs GCVW) It got the exact same gas mileage when I traded as when it was first broke in. (I checked it regularly). I put the second set of plugs in it right before I traded and the ones I took out had only normal wear and color. No deposits. It's my feeling (IMHO) that using a good quality oil and filters at regular intervals is about as good as it is going to get. You can spend a lot more if it makes you feel better but in 35 years of driving and maintaining all my own equipment I haven't seen the need. P.S. I used Delo 400 inn my 79 Pete with 400 Cummins. Also good luck.