Mobile One Oil Question

[smiledr996s]

I recently purchase a 2500hd 6.0 w/ 70k miles. I have no history of service. I know the truck was used hard,and not sure it was properly service w/ oil changed. I want to start running Mobile One. It calls for 5w-30, but wondering if I should use the Highmilage formula and move up to 10w-30??

 

Thanks for any suggesstions.

Steve

[fcknmaw]

Stick to 5-30 and use high mileage if you wish. I use high mileage oil every 5-6k on all my vehicles.

[Spurshot]

The 10-30 and 5-30 should be the same viscosity at operating temperature. At startup, the cold oil will be much thicker than ideal with both. The 5-30 will be better at start/prior to warmup operation. If you're looking for a thicker oil at normal operating temperature, the latter number has to go up. I'd go with the book recommended range.

[ocean4200]

mobil 1 5w-30 is perfect for almost most situations (even in winter where temp is very cold). I don't see why you would use 10w-30 here.......

[clemsonblozz]

The 10-30 and 5-30 should be the same viscosity at operating temperature. At startup, the cold oil will be much thicker than ideal with both. The 5-30 will be better at start/prior to warmup operation. If you're looking for a thicker oil at normal operating temperature, the latter number has to go up. I'd go with the book recommended range.

 

 

here in the warm south,, I used 15w-40 premium blue forever in my 5.3.. It got rid of that friggin "after it sits a couple of days" lifter chatter.. I wouldn't advise using oil that thick in the colder climates..

[WilliamBos]

5w30 synthetic is the way to go for sure. I run it all year round.

[smiledr996s]

Thanks,

 

I will stick w/ the 5w-30. I was just concerned that I might have some engine wear from poor maintence, and a slightly thicker oil might give a bit more protection. Also since I plan to use mostly to haul a car trailer I thought a bit thicker might help here as well.

 

Thanks for the responces.

 

Steve

[dlstewart01]

Check oil viscosity charts. API allowes a range in viscosity from the manufacturers so there are thicker and thinner 5 wrights and the same with 30 weights.

 

http://www.bobistheoilguy.com/index.php?op...8&Itemid=55

 

 

.Home Viscosity Charts

Viscosity Charts

 

VISCOSITY @ 100deg C

VISCOSITY @ 40deg C

 

MOTOR OILS, HYDRAULIC OILS

ISO GRADE

 

SAE GRADE RANGE (cST) ISO GRADE RANGE (cST)

5

3.80-*

32

28.8-35.2

 

10 4.10-* 46 41.4-50.6

20 5.60-9.29 68 61.2-74.8

30 9.30-12.49 100 90.0-110

40 12.50-16.29 150 135-165

50 16.30-21.89 220 198-242

60 21.90-26.09 320 288-352

80 7.0-11.00 460 414-506

90 13.50-23.99 680 612-748

140 24.00-40.99 1000 900-1100

250 41.00-UP 1500 1350-1650

 

Viscosities can be related horizontally only

Viscosities based on 96 VI single grade oils.

ISO are specified at 40 deg C

AGMA are specified at 40 deg C

SAE 75w, 80w, 85, 5w, & 10w

specified at low temperature.

Equivalent viscosities for 100 & 210 deg F are shown

SAE 90 to 250 and 20 to 50 specified at 100 deg C.

 

ISO VISCOSITY CLASSIFICATION SYSTEM

 

Many petroleum products are graded according to the ISO Viscosity Classification System, approved by the international standards organization (ISO). Each ISO viscosity grade number corresponds to the mid-point of a viscosity range expressed in centistokes(cSt) at 40 deg C. For example, a lubricant with an ISO grade of 32 has a viscosity within the range of 28.8-35.2, the midpoint of which is 32.

 

Rule of Thumb: The comparable ISO grade of a given product whose viscosity in SUS at 100 deg F is known can be determined by using the following conversion formula:

 

 

SUS @ 100 deg F/5=cSt @ 40 deg C.

 

cst= 0.226xSUS-(195/SUS)

 

 

 

 

.

[Daryl LBZ]

I use Mobil 1 5W30 and Mobil 1 Filter on my truck. It's good stuff, and the filter is supposed to be the best one out there. If you want to help the engine out as far as wear is concerned I would use Lucas Oil Treatment along with your oil. The stuff works great. Ive seen it stop and slow oil leaks, and it helps out ALOT with engine noises like tapping, and lifter noise.

[Shatterz]

I recently purchase a 2500hd 6.0 w/ 70k miles. I have no history of service. I know the truck was used hard,and not sure it was properly service w/ oil changed. I want to start running Mobile One. It calls for 5w-30, but wondering if I should use the Highmilage formula and move up to 10w-30??

 

Thanks for any suggesstions.

Steve

 

I wouldn't rack your brain too much about what to use. Mobil 1 is a good oil, run the regular Mobil 1 5W-30 and good quality filter (this makes more of a difference than anything). If you are not burning any oil and/ or hear feel anything that indicates a damaged/worn motor, you should be good to go along with a good pm program of changing all other fluids since you don't have service records. Just my .02.