Rotella vs Mobil

[deerefan]

I have an 06 F250 w/ the 6.0 diesel. After doing some research and listening to people that know these engines inside and out, I will be making the switch to synthetic, w/ changes every 7500. I have been trying to find a comaprison w/ Shell Rotella Syn 15-40 vs Mobil Delvac(?) Syn 15-40 and keep striking out. I run standard rotella 15-40 in my JD 5103 and have no complaints yet. Any input from you guys?

 

[20 20]

I also use dino 15-40 rotella in all of my diesels. Why not just stick with the brand you've had luck with?

I did switch my gas engines over to synthetic and it seems to be A okay. I doubt I'll switch over to synthetic on the diesels. Reason being, I feel it would be too long between changes???? I allready can go for quite a while without an oil change now, why add the exspence to do the same thing. I also have heaters on everything diesel, so there would not be any reall benifit.

 

[GreatWhitehunter]

I switched to syn for my 04 6.0 psd and I wish I had done it sooner. The truck warms up much faster and is alot quieter. I started out with mobile 1 full syn and was happy with it. Then all of a sudden retailers here stopped carrying it. So I tried the rotella full syn and have been using it since late 07.
I've had good luck with it and have sent samples out for eval. I've been able to go 10k without change due to the oil samples. My dealer chargers $115 for a dino oil change and I can diy with the syn for the same. So I think it makes sense.

Matt

 

[deerefan]

I also use dino 15-40 rotella in all of my diesels. Why not just stick with the brand you've had luck with?

I did switch my gas engines over to synthetic and it seems to be A okay. I doubt I'll switch over to synthetic on the diesels. Reason being, I feel it would be too long between changes???? I allready can go for quite a while without an oil change now, why add the exspence to do the same thing. I also have heaters on everything diesel, so there would not be any reall benifit.

One reason was it was suggested by many mechanicis this engine, being strongly controlled by oil, benefits a lot from synthetic. Something to do with the high pressure oil injection(??)

 

[Dargo]

I have an 06 F250 w/ the 6.0 diesel. After doing some research and listening to people that know these engines inside and out, I will be making the switch to synthetic, w/ changes every 7500. I have been trying to find a comaprison w/ Shell Rotella Syn 15-40 vs Mobil Delvac(?) Syn 15-40 and keep striking out. I run standard rotella 15-40 in my JD 5103 and have no complaints yet. Any input from you guys?

I've run both. I personally like Delvac better but will go with Rotella if it's a lot cheaper. Most every diesel mechanic I know refers to Rotella as about the best "cheap" diesel oil you can get. I'm not really sure of the meaning of what they say, but unless you go with Rural King's house brand or something like that, Rotella is about the cheapest stuff out there. I have never done any used oil analysis' and compared Rotella to Delvac but some guys I know claim to have done so and that the Delvac holds up better. Again, 2nd hand, so don't take that as me stating fact. The only thing I know was that when I was working in the mines they switched from Rotella to Delvac for all their equipment. Still, that could have been price driven and it wasn't synthetic.

 

[fredkos]

Deerefan: if you want a synthetic it would be Delvac 1 and 5-40-Mobil Turbo Diesel Truck Oil is Del 1, this confirmed to me by Mobil.

This is what I have found out in our E450 6.0, '07: I switched from whatever the factory fill is to full synthetic when we took delivery of the rv from the upfitter, about 700 miles.

My psd, which I love-37k miles of flawless operation- 14/16 mpg (remember it is an rv, 14k-gvw), in fact it is the only good thing about the crappy rv we bought really likes to have 15-40 oil. To date I have tried two fills of Del 1, three fills of Amsoil Marine Heavy duty diesel, one fill of Amsoil 30 10/30 diesel oil, and one fill of full syn Rotella-I change roughly every 4k miles.

Whenever I have switched from 15-40 to another weight I see very very slight oil consumption, less than a quart-with the exception of Amsoil 30 weight which was even less -with the 15-40 the level on the stick is the same at change and fill.

I am going back to 15-40 and staying there, and I am going back to Amsoil permanently also, there really is a difference and I DO NOT sell the stuff.

 

[bp fick]

For us, in the dead of winter, that 15w-40 is just too much. Around here guys either run 10w30 for diesels, which is admittedly not as easy to find, or switch to one of the synthetics for quick, cold flow. Typically, that would 5w-40 in either Mobil or Rotella. Shrug? They are both fine oils. You mentioned the price does differ from time to time and place to place. Agreed.

 

[Diamondpilot]

I have a 04 and a 06 6.0 psd and have ran Mobil Delvac in both since day one. I have heard bad things with Rotella and the 6.0 but that was early on due to foaming. I know for a fact Rotella was reformulated to handle this but I just stuck with the Delvac.

What is funny is I run dyno Rotella in my tractors. Go figure.

Chris

 

[sw03]

Depends on what someone is looking for. Better wears, longer drains etc.

I know I cannot stand Mobil CS and Rotella in some parts is a cult..Use what you want since NO ONE can say what is the better of the two. If they do, prove it bud..LOL

 

[Skyco]

I switched to syn for my 04 6.0 psd and I wish I had done it sooner. The truck warms up much faster and is alot quieter.

Quieter I'd believe....warms up quicker, uh no I can't believe that one
If anything the 15w-40 would warm up quicker due to increased internal drag when cold

 

[fredkos]

Regarding pricing, if you become an Amsoil preferred customer you can buy the product-usually its most cost effective in the 2.5 gallon quantities-for LESS than Del 1 even with the shipping-granted its not a whole lot less but cheaper none the less.
Currently there is Rotella syn in it, from Walmart, and the cost was roughly .30 more than had I gotten Amsoil.

Now, what I found out about the marine/heavy duty diesel oil from Amsoil; part of the formulation is to allow the oil to cling to surfaces longer-and for an rv that seems perfect.

Also; both Mobil/Delvac 1 and Amsoil 15-40 have a tbn of 12. I know of no other 5-40 with a 12 tbn, I have only seen 10.

If the 6.0 did not have the heui I probably would go back to dyno-maybe.

 

[GreatWhitehunter]

Quieter I'd believe....warms up quicker, uh no I can't believe that one
If anything the 15w-40 would warm up quicker due to increased internal drag when cold

Ok you got me, I'm lying. The truck warms up faster for sure. Why is that hard to believe? Syn oils flow better when cold than dino's do. Just stating my results. 6.0 are hard on oils and they syn(if run early on) makes good sense in this engine.

Matt

 

[Dargo]

Regarding pricing, if you become an Amsoil preferred customer you can buy the product-usually its most cost effective in the 2.5 gallon quantities-for LESS than Del 1 even with the shipping-granted its not a whole lot less but cheaper none the less.

You sure about that? I dropped Amsoil about 2 years ago when they just priced themselves out of the market as far as I was concerned. Heck, I had like 4 or 5 people who became 'dealers' through me and was a 'preferred dealer' or whatever they call it in their Amway type selling layout. Even so, after that round of price increases they became far more expensive than Royal Purple in almost every category. I have done UOA between Amsoil HD diesel/marine 15w40 and Royal Purple's version and the results were both very good. Since I could simply go pickup Royal Purple at a local parts store who sold it far less than retail, I dropped Amsoil and just started using all Royal Purple. For things like my motor coach that use 40 quarts of oil per change, there was a substantial difference in the price of an oil change after Amsoil became considerably more expensive.

Maybe Amsoil dropped their price since everyone I know who was buying Amsoil pretty well dropped them back then too. I don't know.

 

[SPYDERLK]

Quieter I'd believe....warms up quicker, uh no I can't believe that one
If anything the 15w-40 would warm up quicker due to increased internal drag when cold

Ok you got me, I'm lying. The truck warms up faster for sure. Why is that hard to believe? Syn oils flow better when cold than dino's do. Just stating my results. 6.0 are hard on oils and they syn(if run early on) makes good sense in this engine.

Matt

I agree with Skyco. He is talking time to temperature. I think youre talking time til it runs smoothly. You could consider that "time to warm up"...,but not exactly.
larry

 

[fredkos]

Dargo, yes the pricing is less; in the 2.5 gallon containers the per quart price last time I bought was $5.38, marine hd oil, the 30-10/30 was a bit more, add the shipping and Amsoil was still less than Del 1 and Mobil Turbo diesel, $6.84 as I recall.

The end price is not a lot less, but it is positively less-I might be saving a 5er per change.

In the very recent past I always referred to Amsoil as Scamsoil and this is what changed my mind.
Did a service call at an engine builders shop, he was a retired race car mechanic-Offenhauser (sp?) engines, in charge of rebuilding them for the team-now he does work for the local street rod community. He had cases of Amsoil in the garage and I asked him about it-all he used. What I did not ask if they, Amsoil was the sponsor of his team-but even if they were this guy was 100% committed, and he was refusing work-two years out.

I do an oil analysis every other oil change, but as it has worked out-each time was Amsoil, the numbers are incredible-very-very low wear metal values and more importantly, 'negligible' indication of oil shearing (sheering?).

 

[SARG]

I've determined after tons of reading that my best solution is to just use the Rottela or the Delvac 15W40 and change every 25 hours with the PureOne filter.

Much better for the tractor and also cheaper as compared to what others are doing.

 

[Dargo]

... change every 25 hours with the PureOne filter.

Much better for the tractor and also cheaper as compared to what others are doing.

Every 25 hours?? That would get rather expensive even using Rotella or Harvest brand motor oil, wouldn't it?

 

[SARG]

Not really. The Devac or Rotella is a little over $10. per gallon & the machine takes 3.5 qts. The filters are bought by the case through Amazon for $4.75 each.

If I really use the tractor and change the oil four times per year that's still under $60.

Last time I looked the Amsoil was $32. per gallon.

 

[fredkos]

sarg, many smart people would agree with your choice of product and schedule, and in fact a few would say that yours is the best program.

I never subscribed to extended oil changes, or even going the recommended interval, we all are in the severe category, or 99% of all of us anyway.

Change early and change often, wise words, synthetic does offer benefits, but in the end, 120$ oil changes ever 4k is kinda sorta nuts, its just that I cannot help myself-it makes me feel good, and perhaps that is really the reason why I, and others go synthetic.

 

[chevyman29]

how about the rottella T6 full synthetic it looks to be better than the mobil delvac.