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Hmmm. I put the new stuff in my tacoma last oil change with blind faith that the reformulation would not be a bad one. Since my engine sheers oil to smithereens after 1000 miles, this lighter viscosity is probably a bad thing.
Anyone care to speculate on why/if the viscosity change was done and if it was intentional by the blender? A better base oil with a lighter viscosity makes sense if it doesn't sheer back. However, I've already found info on the internet that DS is still group II, but it was from an ad.
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Hmmm. I put the new stuff in my tacoma last oil change with blind faith that the reformulation would not be a bad one. Since my engine sheers oil to smithereens after 1000 miles, this lighter viscosity is probably a bad thing.
Anyone care to speculate on why/if the viscosity change was done and if it was intentional by the blender? A better base oil with a lighter viscosity makes sense if it doesn't sheer back. However, I've already found info on the internet that DS is still group II, but it was from an ad.
I asked Chevron this question. The answer:
"The decrease in the viscosity at 100C results from an improvement in
the shear stability of the viscosity modifier. The more the viscosity
modifier shears, the higher the initial viscosity must be. By
increasing the shear stability we can lower the fresh oil viscosity
which can improve fuel economy and low temperature properties of the
oil."
"The new viscosity improver makes it possible to provide the same protection without using that more viscous oil to compensate for the heat. The HT/HS (High Temp/High Shear) for the new oil is basically the same as it was for the former Havoline with a more viscous oil."
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Hmmm. I put the new stuff in my tacoma last oil change with blind faith that the reformulation would not be a bad one. Since my engine sheers oil to smithereens after 1000 miles, this lighter viscosity is probably a bad thing.
Anyone care to speculate on why/if the viscosity change was done and if it was intentional by the blender? A better base oil with a lighter viscosity makes sense if it doesn't sheer back. However, I've already found info on the internet that DS is still group II, but it was from an ad.
I asked Chevron this question. The answer:
"The decrease in the viscosity at 100C results from an improvement in
the shear stability of the viscosity modifier. The more the viscosity
modifier shears, the higher the initial viscosity must be. By
increasing the shear stability we can lower the fresh oil viscosity
which can improve fuel economy and low temperature properties of the
oil."
"The new viscosity improver makes it possible to provide the same protection without using that more viscous oil to compensate for the heat. The HT/HS (High Temp/High Shear) for the new oil is basically the same as it was for the former Havoline with a more viscous oil."
Don't you love it when a company is willing to answer your questions intelligently and with answers that make sense, and not with marketing blather?
Likewise, the thinner 100C viscosity. But I suppose once you add a good slug of zddp booster to this oil, you'll get the viscosity back up where it ought to be, somewhere on the higher side of the 30 weight range.Quote:
Don't think moly is the magic bullet. The companies adds are there to make the oil pass SM tests and nothing more.