5-40 vs 15-40 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 42 (permalink) Old 04-16-2009, 01:43 AM Thread Starter
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5-40 vs 15-40

I've read every thread in this section and i'm leaning towards the valvoline 5-40 blue oil . I just wanted to ask a direct question instead of dancing around it . Should i run 5-40 or 15-40 in my 2004 6.0 ?? I'm in delaware ( so it's not really cold but it gets into the high 90s in the summer ) if it helps.
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post #2 of 42 (permalink) Old 04-16-2009, 01:34 PM
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Re: 5-40 vs 15-40

well elite told me to run 5-40 but ive been running 15-40 cause it really doesnt get cold here in cali. i think im switching to 5-40 next cause they said my injectors like it better. you will be fine with either one though.

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post #3 of 42 (permalink) Old 04-16-2009, 02:10 PM
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Re: 5-40 vs 15-40

Im running 15-40, and you should be fine with it, but the 5-40 would be better. Just whatever you want to run (and pay).

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post #4 of 42 (permalink) Old 04-16-2009, 02:25 PM
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Re: 5-40 vs 15-40

X2 i run 15w-40 in my truck, next oil change i do, switching to 5w-40 valvoline premuim blue, also highly recommended from Adam at FCDP.

06 F250 Lariat CC SB FX4 6.0, EGR Delete by FCDP , 58v FICM by Quick Tricks, Autometer Gauges (Boost, Pyrometer, Trans. Temp), SCT X3 W/ IDT, 4" TB Straight Pipe, S&B CAI, ZOODAD, Retro-Solutions HID Kit (4300k), CCV Mod, Coolant Filter

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post #5 of 42 (permalink) Old 04-16-2009, 08:04 PM
 
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Re: 5-40 vs 15-40

Is there something wrong with the Rotella 5w-40w Synthetic, thats what i run.
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post #6 of 42 (permalink) Old 04-17-2009, 02:39 AM
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Re: 5-40 vs 15-40

As you 6.0L owners know - the 6.0L runs some pretty high ICP and can shear just about any engine oil before 5K. Here is my 2 cents.

If you are operating in a cold temp environment then you will benefit from the cold start performance of a 5W-40, otherwise I would lean towards the 15W-40. Both 5W-40 and 15W-40 work well in the 6.0L, but on average the 5W-40 oils tend to shear quicker than the 15W-40of the same brand in this application. Basically the 5W-40 oils have more polymers to make it a 40 weight oil at temperature than a 15W-40. Under high pressure & temp the polymers can start to break down.

You can try the 5W-40 version and do an oil analysis at 4K and see what the results are yourself, but here is one that was just posted recently on another forum. The 5W-40 Valvoline showed very good wear results but it broke down from a 40 weight to a 30 weight by 3,680 miles (CST viscosity at 100 deg C) dropped below 12.5. I'll see if a can find one of a 6.0L running the 15W-40 Valvoline.


2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
2000 Excursion- Pwrd by: T Wildman 6 pos chip, CT Performance Suspension, Riffraff Diesel Performance, J&M Tranny, 4" MBRP, 6637 filter, intank/prepump mods
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post #7 of 42 (permalink) Old 04-22-2009, 03:53 PM Thread Starter
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Re: 5-40 vs 15-40

good info so far, bump for any other opinions
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post #8 of 42 (permalink) Old 04-24-2009, 12:07 AM
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Re: 5-40 vs 15-40

5 ppm is a high lead #? My report has the lead at 13 ppm on the schaeffers 5w-40 and 7 ppm on the Royal Purple 15w-40. Wow, I'm way above universal averages also which is 3 ppm! WTF? My 5w-40 Schaeffers sheared down to 11.9 in 5700 miles and the Royal Purple 15w-40 sheared down to 12.31 in 4800 miles . Any suggestions?

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post #9 of 42 (permalink) Old 04-24-2009, 03:23 AM
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Re: 5-40 vs 15-40

Don't worry about the lead numbers. Yours are way low on all your reports. Lead is considered normal under 100 ppm in diesel engines. Blackstones flubbed this reports write up pretty bad. Don't put too much merit in there Universal Average column. Everyone likes it because it gives them a number to chase, but in fact they are only averages of the reports blackstone has done UOA on. For example - Blackstone has iron's Universal Average as 17 ppm for the 7.3 at 5200 miles - Navistar/International has Iron as normal under 200 ppm. Other labs like Schaeffer's, Polaris & OAI consider iron normal under 100 ppm for diesel engines. Sometimes I think it is Blackstones way to get people to chase numbers on their UOA reports and buy more kits.

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2000 Excursion- Pwrd by: T Wildman 6 pos chip, CT Performance Suspension, Riffraff Diesel Performance, J&M Tranny, 4" MBRP, 6637 filter, intank/prepump mods
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post #10 of 42 (permalink) Old 04-24-2009, 03:58 AM
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Re: 5-40 vs 15-40

I don't guess your a fan of blackstone. Aren't they independent? Why would they fudge reports if they are not associated with any oil company? Seems like they would have nothing to gain. Doesn't Schaeffers have their own lab? Not saying that they would do it but, they would have A LOT to gain if they slanted the report to make their product shine. Just thinking out loud and not making any accusations.

As far as what's normal..... I wonder sometimes about what these manufacturers claim to be OK or normal. I had a GMC van once. From the day it rolled off the lot with no miles on it it used one quart of oil every 500 to 1000 miles. I figured it just wasn't broken in yet so I drove the fire out of it. After putting about 35,000 miles on it I took it in to complain about the oil consumption They told me it was normal depending on how loaded down the van was (it was a one ton van). Even after I told them it stayed mostly empty all the time they claimed that it was normal. Now in my opinion, normal is what most vehicles consume and I didn't know anybody else with a GM workvan with that same engine that consumed that much oil, as a matter of fact most didn't even use a quart in 3000 miles. Would that be considered unusual to only consume less that one quart in 3000 miles. I don't think so! There fore I don't want what these manufactures consider to be normal, I want to be above the average if possible. Get my drift? I don't see anybody else with these higher numbers, and I'm using synthetic which is supposed to be better and cost more so I want to see lower than average numbers! That's why I'm whining about my lead numbers and the viscoscaty
numbers breaking down!

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