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Just what the title says. I'm looking for the least expensive oil I can find that meets the Ford F1 spec for the 6.7 powerstroke. I can find 15W-40 sales down to about $10/gal but finding 10W-30 deals is usually harder. Any suggestions?

Is there a difference between these two? Thanks. Rotella T4: Traveller:

So I've been using RL in my 6.7 since the first oil change. All is good. About 50k miles on it now. It's expensive... probably close to $130 per oil change. Really really expensive. But I do it because I thought it was better. So then I was reading some more and someone wrote (I don't remember...

I don't intend to get into a CK-4 or Ford debate. But, when Ford first released the F1 spec they said that the spec would require an oil to meet CK-4 specs, plus FMC's 6.7 wear test(s). As an interim measure, Ford allowed any oil that was CK-4 and also had min. 1000 ppm phosphorous to be on the...

2017 F-350 Powerstroke... Since break-in, I've used Red Line 15W-40. Due to the expense, I'd like to switch to another oil but I'm concerned that the switch might result in a leak. As I understand it, Red Line might tend to swell seals more than other oils. Thoughts? Am I overthinking it? Thanks.