Hi Scotty. Is bad for an engine to use an oil that have a lower viscosity at cold temperature but the same , that is specified by the manifacturer, at hot temperature?

Pietro09

Hi Scotty. Is bad for an engine to use an oil that have a lower viscosity at cold temperature but the same , that is specified by the manifacturer, at hot temperature?

Comments (4)
No. 1-2
Pietro09
Pietro09

Ok, I know that. So use an oil with a lower viscosity in winter than the one specified by manufacturer, could damage the engine? (For example: I use 5w40 instead of 10W40 (specified by manufacturer)).

Techsus
Techsus

Modern engine oil is engineered to have variable Winter (lower)/Summer (higher) viscosities.