Quote Originally Posted by e240 View Post
Relax - Its not going to harm your engine, its not like a 25w-50 oil has the consistency of chocolate pudding. Your car will run fine but maybe your butt dyno will find it a little sluggish but thats about it.

Change it if it makes you feel better, but thats about it,
It will be fine at operating temperature as 50 weight is not that thick. But during cold startup especially with the recent cold weather, there will be a little bit more wear as it will take a bit longer to circulate compared to the spec'd 10w or even 15w.