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why is mobil 1 0w-40 not labeled energy conserving on the api starburst? all the other weights of mobil 1 are. the engine starts up alot quieter & less harsh
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#1 (permalink) |
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why is mobil 1 0w-40 not labeled energy conserving on the api starburst? all the other weights of mobil 1 are. the engine starts up alot quieter & less harsh sounding in the morning with this oil.
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#2 (permalink) |
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because at operating temp the "40" weight oil is much thicker then a "30" or "20" weight oil. The second number in Xw-XX is the viscosity at 212 degrees . 40 will protect the engine better at oil temps above 230 but will hurt fuel economy.
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#5 (permalink) | |
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#6 (permalink) |
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Just drained my Mobil 0w-40 out after 8k miles & 10 months. Hated to do it because it still looked clean & clear. I really think European formula oils are much better than regular synthetics. Also use it in my 4Runner with 185k miles & looked good after 10k & 8 months.
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