HT/HS

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34,034
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Southern NJ
Does anyone know what has a higher HT/HS between Amsoil 0w-30 and M1 0w-40? I notice Mobil doesnt post HT/HS data on there website..hmmm. I'm thinking ahead to far, but for next summer I want the higher of the two bc my engine runs hot. I have the 0w-30 wt comparisons, but not the 40. Also, Isn't this for Diesel engines? AMSOIL CASTROL MOBIL VI: 188 181 176 HT/HS 3.5 3.1 3.4 WEAR: .39 .47 .45 ASH: N/A .93 N/A FLASH: 460 410 460 [ November 26, 2002, 10:36 PM: Message edited by: buster ]
 

driven2services

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Mobil 1 0W-40 and 15W-50 are both qualified for ACEA A3-02, so their HT/HS is at least 3.5. Amsoil HDD Series 3000 5W-30 is dual rated for gasoline and diesel engines. It has an API Service Classification SJ and ACEA A3-02, and both are gasoline engine ratings. SJ was the top rating before July, 2001, and A3-02 is the top European rating (and tougher than SJ or SL). Ken
 
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Buster, The Mobil 1, "trisynthetic" 0w-40 came in @ 3.6 Cp. It is more difficult to make a shear stable oil in these wide range multigrades like 0w-40 or 5w-50, due to the amount of VI improver needed. A 0w-40 or 5w-50 will also tend to thin out more at high shear rates, since the polymeric thickeners align themselves in the direction of oil flow. If you were to take a 10w-30 and a 0w-40 that started out with the same HT/HS viscosity, the 10w-30 would tend to hold it's original properties longer in actual service.
 

buster

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34,034
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Southern NJ
Thanks guys. Knowing that, i'll go with a 10w-30 in the summer months.....I wish I lived in a warm climate like Florida, Texas or Arizona....I don't like winter. [Frown]
 
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