Will thinner oil reduce cold start rattle?

[MikenOH]

When I switched to 15W-50 last year, my first start out of hibernation went ok but after it warmed, I had the ticking associated with a flat lifter.

I've changed to Syntec 10W40 and have not noise at all either at start up of after on the road for an hour. I have to say that using Syntec has seems to have gotten rid of all the ticking or metallic noises coming from the engine.

[Mark_T]

+1 on the Syntec. I just changed from M1 0w40 to Syntec 5w40 yesterday and I am amazed by the reduction in mechanical noise, especially at start-up. The motor seems to run much smoother.

Why 15-50, btw?

[Cloudsurfer]

A lot of people think that heavier is better in terms of oil weights, and that it will offer more protection, but the thing that you have to keep in mind, is that during a good part of an engine's life, the oil is not at operating temp, and this is the area that you really want to choose the lesser of evils in.

Also, while we certainly need oil pressure, more is not necessarily better, while more oil flow is always better.

There is a great article on Ferrari chat that I have linked below. If you'd like to kill a few hours reading this, this is some excellent information in it.

http://www.ferrarichat.com/forum/faq.php?faq=haas_articles