Mixing 5w30 with 0w40?
Mixing 5w30 w/0w40? I have 2 extra quarts of mobil 1 0w40, while im running mobil 1 5w30 in my car right now, its a lil low because of a leak, is it ok to mix the 2 or do i need to get 5 30?
TECH Fanatic
Joined: Apr 2005
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From: Just This Side of Damnation
It won't cause problems. Mobil synthetics are compatible with each other, and nowdays almost all synthetics are compatible with each other.
Research and learn about them to increase your knowledge base and comfort factor.
Research and learn about them to increase your knowledge base and comfort factor.
Yes,it is ok to mix the two.The 0w part is of lower viscosity than the 5w and will provide easier flow at start-up.The 40 part is of higher viscosity than the 30 part and will maintain viscosity and oil film better at operating temperature than the 30.A 0w40 has a HIGHER viscosity INDEX than the 5w30 and higher viscosity index is always preferred because of higher viscosity stability.
TECH Senior Member
Joined: Nov 2001
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From: Mississauga, Ontario
Originally Posted by FirstYrLS1Z
Yes,it is ok to mix the two.The 0w part is of lower viscosity than the 5w and will provide easier flow at start-up.The 40 part is of higher viscosity than the 30 part and will maintain viscosity and oil film better at operating temperature than the 30.A 0w40 has a HIGHER viscosity INDEX than the 5w30 and higher viscosity index is always preferred because of higher viscosity stability.
