10w-30 Mobil One Syn.

[Phillipjon]

Is it okay to use? I know That GM recomends 5w-30, any thoughts?

[rodram]

... my opinion ... 10W30 is OK to use, because when the engine is hot you have the same lubrication as 5W30

... BUT I would not use it in your new 2009 if you are in a COLD climate area and you are starting the truck cold every morning

 

... the mitigating factor though is that the synthetic oil will flow better when cold than a conventional oil,

 

... I used 10W30 synthetic in my '02 3800 series II engine... because GM called for that oil grade in that engine, and I never had any starting problems in the cold weather.

[Black02Silverado]

Will be just fine to use. No issues at all.

[dlstewart01]

No problem. Very little difference between 5 and 10. both will be 30 at operating temp.

 

0w, 5w, 10w, etc.is not weight but an somewhat arbitrary rating based on the oil low temperature flow and pumping characteristics - SAE J300 (1999) Motor Oil Grades- Low Temperature Specifications. I say somewhat arbitrary in that an oil that meets the 0w standard can be rated 5w or 10w because of the myth that "W" means weight (W means winter) and 95-99% of the folks that recommend/sale/change oil believe this myth. We'll all heard "I would not use a 0 weight oil in your car.".

 

Mobil 1 10W30 has a pour point of -45

 

Typical Properties

 

Mobil 1 10W-30

 

SAE Grade 10W-30

Viscosity, ASTM D 445

cSt @ 40º C 62

cSt @ 100º C 10.0

Viscosity Index, ASTM D 2270 147

Sulfated Ash, wt%, ASTM D 874 1.0

HTHS Viscosity, mPa·s @ 150ºC ASTM D 4683 3.14

Pour Point, ºC, ASTM D 97 -45

Flash Point, ºC, ASTM D 92 224

Density @15º C kg/l, ASTM D 4052 0.86

 

[Phillipjon]

Thanks for everyone's help.

[CapitalTruck]

Why you want to run 10w30 as opposed to 5w30, you accidentally buy a bunch of it?

[spikesputnik]

I touched on this subject a while back, somewhat as a theoretical exercise. My thinking is that IF one lives where it will NEVER get below say 20*F at the coldest, ever ( for example if Florida really is is hell, then that is just that seriously freezing over...) then what would be the benefit of using 5w instead of 10w?

My rationale is, as misguided as it may be, an oil expected to flow appropriately over a more narrow temperature range may retain its operating temp viscosity spec after thousands of miles of use. For example might 5w-30 actually be 25 wt after 5000 miles , where as 10w-30 may stay closer to 30?

[dlstewart01]

I touched on this subject a while back, somewhat as a theoretical exercise. My thinking is that IF one lives where it will NEVER get below say 20*F at the coldest, ever ( for example if Florida really is is hell, then that is just that seriously freezing over...) then what would be the benefit of using 5w instead of 10w?

My rationale is, as misguided as it may be, an oil expected to flow appropriately over a more narrow temperature range may retain its operating temp viscosity spec after thousands of miles of use. For example might 5w-30 actually be 25 wt after 5000 miles , where as 10w-30 may stay closer to 30?

 

There would not be a problem at all. Most people don't understand the 5 or 10 rating anyway. The 5 and 30 are calculated two completely different ways.

 

0w, 5w, 10w, etc.is not weight but an somewhat arbitrary rating based on the oil low temperature flow and pumping characteristics - SAE J300 (1999) Motor Oil Grades- Low Temperature Specifications. I say somewhat arbitrary in that an oil that meets the 0w standard can be rated 5w or 10w because of the myth that "W" means weight ( it means winter) and 95-99% of the folks that recommend/sale/change oil believe this myth. We'll all heard "I would not use a 0 weight oil in your car.".

 

For a complete understanding of SAE J300 and oil weights see...

 

http://mysite.verizon.net/oldhokie/windyridge/oil.pdf