I switched to Lucas Synthetic 20 W 50 and after a 50 mile ride I noticed the engine rpm at idle rose about 200 and my oil temperature dropped 30 degrees.

 

Lucas is a good product just like the rest of the top brands .But I aint buying that one bit.
No way on earth the syn oil dropped oil temps 30 degrees or increased rpms.
Been at this too long.
Kind of like the Amsoil posts on how it raised the dead.
I repeat NO engine oil will reduce temps 30 degrees

 

I just switched to Lucas as well for motor and tranny. While it seems to quiet things down a bit, I haven't noticed any dramatic temperature changes.