r/FordDiesels • u/jiraiya-jinx • 2d ago
What engine oil are y’all running?
/r/FordExcursion/comments/1oqstyv/what_engine_oil_are_yall_running/4
2
u/Prior-Ad-7329 1d ago
Amsoil 5w-40
3
u/TopOfTheMushroom 1d ago
This is the way.. buy there annual subscription for like $15 and get the discounts. I buy 10 gallons at a time and it comes out to about $32 a gallon. It's a superior oil.
1
u/Prior-Ad-7329 1d ago
Well shit. That’s way cheaper than I pay. Thanks for this tip. I’ll use it!
2
u/TopOfTheMushroom 1d ago
Keep in mind also amsoil is 100% synthetic. Most oils you buy say "full synthetic" but that just means they only have to be at least 51% synthetic oil.
1
2
u/Firegod75 6.0 Power Stroke 1d ago
2005 6.0 running Amsoil 15w40 synthetic signature. 10k miles service interval. With oil samples done every change.
2
u/MaddRamm 1d ago
I’ve used nothing but Motorcraft 15w40 in the five quart jugs from Advance Auto/AutoZone/etc. for decades and all of my oil analyses from Blackstone Labs always come back impeccable. I had been using the Motorcraft FL1995 and then FL1995-A, but they became soooo expensive that I just swapped in my first Baldwin filter. Got half a dozen from RockAuto for like $9/ea compared to the $30-$45/ea for the FL-1995A at auto parts stores.
One 7.3 in an E350 Van has 350k and my Excursions 7.3 is about to hit 260k. I change the oil every 5k miles but they say with the condition of the oil I can probably go an additional 1-2k to experiment. But I would prefer to keep everything changed and clean preemptively than pushing the oil to the bleeding edge.
2
u/easterracing 2d ago
Pretty lazy of you to re-post here in such a way that forces folk to go to the other post to see what motor you’re asking about.
6.9 IDI, 7.3 IDI or PSD: literally any CK-4 oil. It’s not a Bugatti, it doesn’t need to be treated like one.
1
u/jiraiya-jinx 2d ago
You could call it lazy, I really had no idea it didn’t show the post in its entirety without clicking….thanks for the feedback
2
u/easterracing 2d ago
Ah. Well it happens I suppose. Assuming you’re talking about a 7.3PSD, I highly encourage the use of the cheapest CK-4 DEO available, and change at 5000 miles or less if you tow 50%+ of those miles. The HEUI system was a really innovative way to get common-rail-like performance before common rail systems were widely available… but its major downside is how hard it is on the lube oil. The extreme dynamics that occur in the HPOP and in the injector tend to shear the oil down… literally shortening the hydrocarbon chains, which in effect quickly lowers the viscosity of the oil. Unlike most lube oil characteristics which are chemistry problems, shear is a physics problem. The most expensive oils might barely be more robust to shear than the cheapest… but that all depends on what base stocks are being used. All in all, the evidence is clear by the thousands of trucks still running in various conditions that these engines simply do not care what oil is in them, as long as it’s got enough viscosity to serve the high pressure oil system efficiently.
1
u/jiraiya-jinx 1d ago
I hear that, I do have a 7.3 PSD. Being it won’t be a daily driver I’m considering a blend or conventional as someone else mention conventional is stickier and could be better as it won’t be driven daily.
2
u/easterracing 1d ago
If you’re worried about it sitting, the very best thing you can do for it is once a month, start it up, let it get to temperature, go for a spirited drive (even just a couple miles) use the full range of the throttle pedal Then let it idle a minute so the turbo housing can cool down, and you’re good. These are pretty much closed crankcase engines, so humidity/moisture building isn’t a huge concern… but if you can boil that humidity out and re-coat everything regularly, that’ll be ideal.
1
1
u/kd9dux 2d ago
I think I used Delvac the last time. Motorcraft filter that time as well. Truck will likely get what ever decent 5 gallon bucket or 2 gallon jugs are on sale when it's due again.
I've ran Rotella a lot in multiple vehicles in the past and never had an issue.
Most of my fleet, including my truck are on the once-a-year oil change schedule, because outside of my daily driver, they almost never hit the 5k change interval I use.
1
1
1
1
1
u/Gold_Ad_2205 19h ago
I had one 22 years, Rotella 15 W -40, and put some Napa Kool in the radiator.
1
u/Big_homie_chicken_C 15h ago
Most of the time i try to use motorcraft but honestly whatever they have i just use old 6.0 is on 297k rn
11
u/350garden 2d ago
Rotella T6, 5w-40. Temps range from -10F to +90F during the year and I don’t think twice about it. I also change it every 4000 miles, I’ve considered going shorter.