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Ask Mobil Archive -
Viscosity
DateQuestionAnswer
03/02/2009
Do Multi-Viscosity Oils Become Long Molecule Thicker Oils as They Heat Up?
Several of us car buffs at the Propulsion Lab have been arguing about what the numbers mean in multi-viscosity SAE designations. I said "The multi-viscosity oil molecules want to link together as they...
You are generally correct. Multi–viscosity oils contains polymers called viscosity modifiers and these polymers act to thicken an oil as it heats up in order to provide the high temperature viscosity ...
06/28/2008
Is it Okay to Use a Higher Viscosity Oil Than What's Recommended for a Vehicle?
I recently changed my oil to 15W-50 Mobil 1 Extended Performance. I have an old 1990 Toyota 4 Runner with 275,000 miles, rebuilt 75,000 miles ago. I discovered this web site after changing the oil mys...
Either Mobil 1 viscosity grade will provide outstanding protection and performance. For an older vehicle there is a occasional benefit sometimes in using higher viscosity grade oil especially if you a...
03/25/2008
Is There Any Harm to Mixing Different Mobil 1 Viscosities?
I drive a '97 BMW 540i (85K.) on 0W-40, and a 2005 Subaru 2.5L (25K.) on 5W-30. I have used Mobil 1 for at least 10+ years now. I do keep drain intervals right at 5,000 miles on all of my cars, as it ...
Today’s modern vehicles require a less viscous oil in many cases than in the old days. Having said that there is no harm in mixing different viscosities of Mobil 1. They are all compatible with each o...
03/20/2008
Any Horsepower Loss Using 15W-50 Compared to Mobil 1 10W-30?
If you race a low horsepower class (say 120HP to 140HP) is there a horsepower loss in the 15-50W over the 10-30W? I currently use the Mobil 1 10W-30 but in the summer the temperatures outside get up t...
Yes, horsepower is directly related to viscous drag and the higher the viscosity the more viscous drag. That is why many NASCAR teams are using lower viscosity oils. Oils such as such as 0W-20 and 0W-...
01/13/2008
Will Switching to 0W-40 be Better for a Toyota Tacoma in a Hot Climate?
My 2005 Tacoma has a little over 60,000 miles now. It has some "cold start knock" - piston slap, that so many recent engines have. Once warmed up, it only has a faint bit of slap at idle. I have been ...
A 40 grade (0W-40) would provide some relief but your engine does not see this viscosity until it has warmed up. Since it appears to be only an issue during warm-up, you may want to try Mobil 1 15W-50...
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