95blackToy

Been reading about oils recently and have come to the conclusion that a 0w30 would be far better than say a 5w30 or 10w30.

I have a freshly rebuilt 3.0 from raptor engines, so far so good. Will be switching to a synthetic oil soon. Once break in is complete. I'm trying to decide a good oil weigh and have this concept in my head. What do y'all think?

Most engine wear is caused at startup before the engine is warmed up.
We'll since oil thickens when it cools and a 30 weight oil is good for a 3.0 that is warmed up. Why wouldn't a 0w30 be good so that the actual viscosity of the oil when the engine is cold is closer to the viscocity of the same oil when it's warmed up completely.

For example a 0w30 might have a viscocity factor of 10 when hot and viscocity factor of 30 when cold.

Where as a 5w30 would have a viscocity factor of 10 when hot and viscosity factor of 40 when cold

Therefore 0w30 takes less time to thin to the proper viscosity as the engine warms up because it is already closer to the desired viscosity of 10.

So the oil stays at a more consistent viscosity through a temperature range.


Someone correct me if I'm wrong, but this makes since to me.
Also opinions on when to switch. I'm thinking 3000 mile is a good time to switch from conventional to synthetic on the new engine.