No warm up?

[Smallblock454]

If you let the car run at idle, the rpms go down very soon. And that's the problem. You loose oil pressure.

So start your drive before the rpms go down and hold the rpms between 1.500 and 2.500 rpm at low torque until the engine gets fully warmed up.

Just my 2 cents.

Regards, Markus

[10/10ths]

....it's not a matter of "modern" oil.

It's all about the piston rings growing as they and the cylinder walls expand as they warm up and start sealing tighter. If you just sit and idle, you get fuel washing past the rings and the fuel gets into the oil. This breaks the oil down over time. The oil then can't protect the engine internals as well.

Remember, the car runs rich on start-up. This dumps extra fuel into the combustion chamber.

You have a flat engine.

The fuel gets by the rings.

By driving off immediately, the engine warms up faster and therefore the piston rings seal up faster and the fuel injection squirts a less rich mixture faster.

You get less fuel in the oil, and your oil does its job of protecting your engine longer, before it needs to be changed.

Just keep her below 3,000 rpm until she's warm.