by definition, if the oil behaves as the numbers indicate, the HOT viscosity
of 5W30 (I assume that's what you mean) and 10W30 are the same... but 5W30
flows much better at COLD temperatures... especially below zero.... quicker
lubrication to the valve area..I've heard like almost 30 seconds difference
between the two different oils.
of course that's in theory... I just switched from Mobil 1 10W30 to Mobil 1
5W30, and have been watching the oil pressure carefully... have not seen a
significant change...
I don't know if I want to try the 0W30 they have now...
Gary Shook
>> Why do you use 5W50? (Just wondering what the advantages/disadvantages
>>are. I've always used 10W30.)
>
>
> -Jon-
>
>I ahve always used 10W-30 and I think itlets you get better gas mileage.
The
>5W-50 might help if you get the oil real hot towing but with synthetics
that
>is real hard to do. With the gas mileage our trucks get every little bit
>helps.
>
>Roderic
>
>98 4x4 CC 5.2L
>
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