BoatBanter.com - View Single Post

On Sun, 13 Jun 2004 17:00:28 GMT, wrote:

On 13 Jun 2004 16:07:19 GMT, (JAXAshby) wrote:

Oil too thick = may not lubricate completely between surfaces that are closer
together, where the lighter oil is designed to flow.

this is not true in an engine. the difference is important during cold engine
startup.

Are you daft? (retorical question)

He might be, but he might be referring to what was called 'summer oil'
and 'winter oil' by some. It's not that we changed engines; loose
tolerances for the thicker oil of summer, and close tolerances for the
bone-numbing cold of a North Dakotan winter to keep the lubrication in
the crankcase. For those of us who didn't have block heaters, in the
winter, we used 10 weight so we could at least *try* and start the
car.

In winter, if you left 30 weight in the car before you changed the
oil, it wouldn't come out of the can.

This is why you bring the oil into the house the night before.

....then along came multi viscosity oil....10-30, and even 10-40....and
then we thought we were living the easy life.

Yeah, so Jax may, or may not be daft...but there is a an important
difference during cold engine startup.