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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07-11-2011, 10:42 PM | #1 (permalink) |
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0w-40
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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07-12-2011, 04:53 AM | #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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08-03-2011, 02:23 PM | #5 (permalink) | |
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12-17-2012, 07:31 AM | #6 (permalink) |
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fyi
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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