Question for the Gurus
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Mountain Pass
Joined: Mar 2022
Posts: 142
Likes: 64
From: Wyoming
Question for the Gurus
So I have a 1994 F250 7.5L. Owners manual says 5w-30 for it in a cold environment (Wyoming) which is what I used when I did it. I couldn't do it this last time(need both knees replaced)and had Firestone do it. I just noticed on the paperwork it says 5w-20. So I checked Amsoil.com and it says 5w-20, dealership said 5w-20, auto part stores say 5w-20. Question s why the change-fuel economy or government change or? Or is it like the ICM where everywhere listed is wrong part?Is 5w-20 ok as I know it's thinner? Wish I noticed sooner but only put on 30 miles. Thanks for the info.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
Regardless of what the newer recommendations are I have always stuck with 10w-30 for these OBS trucks in the midwest climate. Will 5w-20 hurt the engine....no. There are bigger things in this world you should worry about.
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Mountain Pass
Joined: Mar 2022
Posts: 142
Likes: 64
From: Wyoming
Thank you. And yep more things to worry about. I was just shocked as 5w-20 seems for the newer cars and trucks for fuel economy. Next oil change I will do myself and 10w30.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
There is merit in having a shop do the oil changes. They handle the recycling. Perhaps suggest you want 10w-30 up front next time. On the other hand used motor oil is an excellent chainsaw bar oil. I have "recycled" gallons of Motorcraft semi-synthetic motor oil in my old Stihl Farm Boss chain saw over the years.
Logistics Pro
Joined: Aug 2010
Posts: 3,717
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From: Chillicothe
There is merit in having a shop do the oil changes. They handle the recycling. Perhaps suggest you want 10w-30 up front next time. On the other hand used motor oil is an excellent chainsaw bar oil. I have "recycled" gallons of Motorcraft semi-synthetic motor oil in my old Stihl Farm Boss chain saw over the years.
Tuned
Joined: May 2019
Posts: 480
Likes: 141
From: NJ
Bottom line, it doesn't matter all that much. But since you asked, it's usually a logistical issue rather than an engineering issue. Many places just have tanks of 5w-20 and 15w-40, and everything they service gets one of those grades.
Mountain Pass
Joined: Nov 2021
Posts: 227
Likes: 75
Did you get those knees replaced? Had mine done in 2014. It was the best thing I've ever done. Hurt like he'll for a couple of weeks, but better than 35 years of pain. Had to have my feet rebuilt a year later( bunyans, hammer toes). Then when everything was done I was rear-ended and now have neck, arm issues from whiplash, life is so fun.
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