hey guys, i tried delo 400 this past oil change, just had a quick question about it. it has been cold here in fl (cold for florida) and i never really had an issue with the regular rotella i was using, but i noticed now when i first start it i get a quick romp or 2 than it clears up. but the pedal feels almost dead for about a minute which also never happened with the rotella and it has been about 10 degrees colder than this. does my truck not like this oil?

 

from what ive read on here that is normal in cold weather to get the "romps" until oil gets warm. ive also read that switching to syn oil will clear up the "romps" on startup. others that know more about this will chime in

 

yeah i just thought it was odd that its the same weight oil but its a noticeable difference on start up.

 

I would venture to guess that if you changed it back to Rotella you would probably still see the romps. Like you said, it has been 10 degrees colder. Sounds like that is the cause. Several guys here run Delo and they wouldn't be using it if it wasn't a good product.

 

im sorry what i meant about the 10 degrees thing was it has been 10 degrees colder when i ran the rotella, but now that i have been thinking about it, ive only had this truck for 2 winters and this is the first winter that its had brand new oil, i imagine the oil was getting thin making it start easier, maybe i just needed to type about it to get it lol.

 

Your cool with the delo, your old oil was at a lower viscosity thats why it started a little better, keep up with the oil changes at regular intervals, 5000 miles for 15-40, its the life blood of your vehicle.

 

Switch to syn Shell Rotella 5w40 and you will never go back to dino.. the engine will love it, run quieter and no more romps.. ever.. You can extend your oil changes to make up for the extra cost...

 

I would say that the romps are coming from the EBPV, and the no throttle, It's stuck shut. I did away with all the EBPV 5 years ago, my truck never romps, I run Synthetic oil but that not your problem. I would say that in warmer temp that your truck does'nt do this, no matter what oil.

 

When looking at a XwYY mulit-weight nomenclature...

...the "X" weight represents the oil's viscosity at "cold", or ambient temperatures (like when you're starting the engine and it's 30 degrees, the oil has the viscosity of a "X" weight oil at 30 degrees)'
... the "YY" weight represents the viscosity of the oil at normal operating temperature.

Think about "viscosity" as meaning the same as "how easily it flows and pumps". Higher weight oils are "thicker" and do not pump/flow as well as "thinner" (lower weight) oils.

So, when looking at a 5w40 oil, and the "cold" temperature is 70 degF and the normal operating temperature is 175 degF, that 5w40 oil will have the viscosity of a normal 5 weight oil at 70 degF and the viscosity of a normal 40 weight oil at 175 degF. This means that there is not as much loss in oil viscosity at higher temperatures for a multi-weight oil as there is for a straigh single-weight oil because of the presence and action of viscosity modifiers in the mulit-weight oil formulation.

That said, a 5w40 weight oil will have a thinner viscosity (easier flowing) at 30 degF than will a 15w40 oil. Add to that fact another fact that the 5w oils generally only come from synthetic base stocks (as far as HD diesel oils go, anyway), the synthetic oils have a lower "pour point" than do conventional oils, which means that the 5w40 will flow much MUCH better at 30 degF than the 15w40 oil.

So what?

It has been found that the heavier oils can often cause an engine to romp in cold temperatures due to the thicker oil viscosity, which is why a lot of people will swing between a 5w40 oil in winter and a 15w40 oil in summer. In actuallity, once the oil is heated up, it no longer knows, cares, or behaves like it was when cold because the viscosity modifiers are causing it to behave like a heavier weight oil. That's why I run 5w40 year round... gives me easier startups in both cold and hot weather, and I maintain my 40w lube barrier when the oil gets to normal operating temperature.

The heavier weight oil characteristics are necessary at normal operating temperatures because you need to maintain a lubrication barrier between moving metal surfaces. Since since oil "thins down" (flows better) as it gets hotter, a thin 5w or 15w oil would not provide adequate protection inside your engine at higher temps. At the same time, if you only used a straight 40w oil in your engine, you would have a devil of a time getting it to pump and flow at cold temperatures because the viscosity would be too high.

Therefore, I agree with Clint... switch to a 5w40 for year round benefits, and your romping days will more than likely become a faded memory very quickly.

 

Thanks Pete.. couldn't have said better..!

 

delo 15w40 is the oil! i love that stuff. yea it romps but every motor ive seen running delo has looked great on the inside

 

I agree. My Blackstone UOA's always come back great with Delo's strong additive package, always remaining well above averages at 5k miles. Besides, at only $9-$10 per gallon, I have no desire to switch to other brands or synthetic.

 

I have tried three brands of 15w40 oil in my 2002 F350 7.3 since new. Started with MC 15w40 no issues. Few years later Rotella 15w40 no issues. About two years ago went with Delo 15w40 after reading about it's good additive pkg. Truck seems to like the Delo, runs great. In Maryland, the temps do get cold in the winter, and yes I do get the romps for a few seconds as with any 15w40 I used. The MC and Rotella are good oils, don't get me wrong, but I am sticking with Delo. Main thing, oil and filter changes every 5000 miles to keep the PSD Happy.

 

Delo is a good oil, no doubt. My last OCI was between 17,000 and 18,000 miles on the Schaeffer 9000 5w40 full synthetic, and it is NOT 3x the cost of Delo400, so I know for a fact I'm saving a good bit of money.

Regarding the condition of internals on a Schaeffer lubed engine, when a big Cat engine can go 1,000,000 miles and then have Cat techs declare that the crank, injectors, and mains can go right back into the engine for continued life because they are so close to OEM specs, I consider that the oil has done much more than a typical job... escpecially when the OCI's were over 50,000 miles.

 

I NEVER romped even in the low 20s with Rotella. The first & only time I romped was with Delo, and my engine was noisy as hell. I won't run the stuff again. Ever since then, it's been syn and I won't go back.