mobil1 or rotella t6

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anyone got opinions which is better rotella t6 5w-40 or mobil1 5w-40 diesel. walmart here has the mobil one on sale for only $15 wondering if its as good as the rotella t6?
 
How about telling us what car/engine this is for, what's your driving pattern, planned OCI, etc.?

But all in all, I'd expect M1 5w-40 to be at least as good as T6.
 
Neither is head and shoulders better than the other.

I find the thick visco of M1 5w40 in the winter to be less than ideal, while T6 should provide better cold flow.
 
Originally Posted By: BobFout
I find the thick visco of M1 5w40 in the winter to be less than ideal, while T6 should provide better cold flow.


If I recall correctly, T6 is a 5W-40. Is the brand-to-brand difference in viscosity/flow between different 5W-rated oils when cold really noteworthy?
 
Originally Posted By: heypete
Originally Posted By: BobFout
I find the thick visco of M1 5w40 in the winter to be less than ideal, while T6 should provide better cold flow.


If I recall correctly, T6 is a 5W-40. Is the brand-to-brand difference in viscosity/flow between different 5W-rated oils when cold really noteworthy?


Depends on how much of a difference we're talking about.

Here's visco for M1 5w40
0C : 566
10C: 351
20C: 224
30C: 148
40C: 100
50C: 69
60C: 49
70C: 36
80C: 26
90C: 20
100C: 15

And for T6
0C: 454
10C: 287
20C: 188
30C: 126
40C: 87
50C: 61
60C: 44
70C: 33
80C: 24
90C: 19
100C:14
 
so since the mobil1 is on sale for 5 dollars cheaper basically i should get that because even if the t6 is better the mobil1 is a very close second would that be fair to say?
 
If M1 5w40 is on sale and is cheaper, get it. You cant make a bad decision. Get the one that is cheaper. M1 is a little thicker than the T6 if it matters too you. I personally would not say one is any better or worse than the other. Both are top notch.
 
Originally Posted By: ccapital83
so since the mobil1 is on sale for 5 dollars cheaper basically i should get that because even if the t6 is better the mobil1 is a very close second would that be fair to say?

That's how I take it. I'd go with the Mobil 1 if it was $15.
 
is thicker bad since i get some cold winters here? its about 10 degrees right now we get down to about -1
 
I like the T-6, it is 19.50 here for a gallon so your saving about 1 $ a qt going with the Mobil
 
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