Question about oil
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Senior User
Joined: Jun 2004
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From: NE Ohio
Question about oil
Just wondering if it really matters about using 15w40 during the winter or 5w30 during the summer? I have 15w40 in now and i'll be changing it in another 2000 miles and by that time we'll just be getting into our coldest weather (january febuary) so should i just put 15w40 in then or should i switch to 5w30? I always plug the truck in and when i say coldest we're talking single digits now and then. I think I'd be fine, just wanted to check with the more experienced.
Logistics Pro
Joined: Nov 2002
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From: Mansfield, TX USA
I don't think that there is any diesel oil rated at 5w-30. You need something that is API rated at least CH-4 (CI-4 is better still). You won't find a CH-4 diesel oil that is a 5w-30. You will find 10w-30 in a dino oil and 5w-40 in a syn.
Ford says 15w-40 is preferred down to 30*F and can be used down to 0*F. But if your temps are consistently below 30*, your PSD will start a lot easier with 10w-30.
I see that you are in Ohio, so you will see a lot of <30* weather. Your PSD will probably like a 10w-30 dino or 5w-40 syn. a lot better this winter. Go back to 15w-40 in the spring.
Ford says 15w-40 is preferred down to 30*F and can be used down to 0*F. But if your temps are consistently below 30*, your PSD will start a lot easier with 10w-30.
I see that you are in Ohio, so you will see a lot of <30* weather. Your PSD will probably like a 10w-30 dino or 5w-40 syn. a lot better this winter. Go back to 15w-40 in the spring.
Last edited by jschira; Dec 19, 2004 at 06:09 AM.
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Originally Posted by jschira
...Your PSD will probably like a 10w-30 dino or 5w-40 syn. a lot better this winter. Go back to 15w-40 in the spring.
Posting Guru
Joined: Aug 2004
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From: Braham MN
I have heard that before too about the not being able to switch back and forth.
But why would you wanna switch back to dino once you go synthetic???? you can run the stuff for 50,000 miles as long as you have it tested every filter change, at 5k. another reason for it is the cold weather starts. case in point.
I started my truck last nite at 2:30, it had sat for a good 10 hours so I know she was cold and I beleive the -12 it was COLD!!!she fired right up, wait to start light goes off, crank it, and she just ripped. you will LOVE the synthetic. no doubt about it.
Diesel Rod
But why would you wanna switch back to dino once you go synthetic???? you can run the stuff for 50,000 miles as long as you have it tested every filter change, at 5k. another reason for it is the cold weather starts. case in point.
I started my truck last nite at 2:30, it had sat for a good 10 hours so I know she was cold and I beleive the -12 it was COLD!!!she fired right up, wait to start light goes off, crank it, and she just ripped. you will LOVE the synthetic. no doubt about it.
Diesel Rod
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Originally Posted by The Grinch
You can mix the synth and regular oil, no problen. But I would go Synth at 5W40 and stick to it. Year round.
Hammer
