Originally Posted By: Pontual
Originally Posted By: volk06
Originally Posted By: Pontual
It will be thicker than 5w30 only above 210F and hiher temperatures. If you are short tripper, no noticeable fuel economy penalty. From freezing to 210F oil temp wont give more internal drag than 5w30.
A 0w-40 is still thicker than a 5w30 at almost all temps due to the higher hths. Only in extreme temps, -10F or lower does the 0w-40 become lighter at start up than a 5w30. FWIW
Heres a simple comparison:
Mobil 1 0w-40
Viscosity, cSt (ASTM D445) @ 40ºC 75
@ 100ºC 13.5
Viscosity Index 185
MRV at -40ºC, cP (ASTM D4684)
31,000
HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) 3.8
Total Base Number (ASTM D2896)
11.8
Sulfated Ash, wt% (ASTM D874)
1.3
Phosphorous, wt% (ASTM D4981)
0.1
Flash Point, ºC (ASTM D92)
230
Density @ 15.6ºC, g/ml (ASTM D4052)
0.85
Mobil 1 5w30
SAE Grade 5w30
Viscosity @ 100ºC, cSt (ASTM D445) 11.0
Viscosity, @ 40ºC, cSt (ASTM D445) 61.7
Viscosity Index 172
Sulfated Ash, wt%, (ASTM D874) 0.8
HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) 3.1
Pour Point, ºC (ASTM D97) -42
Flash Point, ºC (ASTM D92) 230
Density @15º C g/ml, (ASTM D4052) 0.855
In the situation I commented, short trips in the end of the year there will be what 0C, in Northern Hemi, running like 1 to 4 miles, most of the time, the oil will be cool enough(below 40C), and the drag will be very similar. So 13.3 to 11cst will be a 10% viscosity difference, but at 40C, below 40C will be less and less.It will take a while to get over 40C, in winter, not in a short trip. Not water, but oil, will delay for the 0C to 40C. The drag difference would take like say 0.11hp with 0w40 and 0.10 hp with 5w30. Negligible. The AC robs much more powrr than that, even a headlight draggingbthe alternator robs more ... Dont need to be a F1 thinking, with a slow truck. Use a smaller spare tire and you compensate the oil drag.
You did not address the statement I was referring too. Your statement said 0w-40 is only thicker than 5w30 at temps above 210F and above. That simply is not true. You just bystepped that comment to a long winded explanation of why the rest of your statement was correct.
And no matter what, no matter how minuscule, thicker oil will always result in a little more drag that a more thin oil. So yes there will always be a little bit more internal drag with a thicker oil. Cant deny physics. Will this result in a MPG loss on a truck? No probably not.
