Nissan 370Z Forum

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- Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs (http://www.the370z.com/nissan-370z-warranty-scheduled-maintenance-servicing-repairs/)

- - 0w-40 (http://www.the370z.com/nissan-370z-warranty-scheduled-maintenance-servicing-repairs/39428-0w-40-a.html)

dawudih

07-11-2011 09:42 PM

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.

secondnissan

07-12-2011 03:53 AM

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.

dawudih

07-12-2011 08:36 PM

Than why are the 10w-40 & 15w-50 energy conserving? They should be thicker than 0w-40...

Methodical4u

07-12-2011 10:17 PM

Amsoil SSO 0w-30 baby!

corner3garage

08-03-2011 01:23 PM

Quote:

Originally Posted by dawudih (Post 1213030)

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.

The engine also starts up a lot quieter mostly because the oil is a lower viscosity when the oil is cold. This gives more cold protection since the oil is thinner at startup, but as the it warms up it also gives the thicker 40 viscosity protection.

-Mike

dawudih

12-17-2012 06:31 AM

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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