quote:Originally posted by Trajan:
Well worth the read.
Smiled when I got to this part: You should try to stay away from the wider spreads like 15W-50, 20W-50 and especially the 5W-50.
I smile too,as this applies to group III,and especially group II oils.
Remember,the high end mustang and many others takes 5w-50 right from the factory,and with every oil change thereafter....and that is normally a group III oil.
I once ran amsoil 20w-50 heavey duty in an 86 regal 5.0 that had 150k on the engine,and over 8k on the now black oil..........in winter with several cold starts that were 0 f,and no issues,not even a single tick. This regal would tick on occasion in the morning during summer using M1 once the oil reached 2k which an oil change or CD2 would fix for a while. Car was sold running better than ever,and never any morning ticking with 190k on the clock......using nothing but the 20-50.
As usual,I will always do the research,and then make up my own mind based on facts. My Jeep that calls for 5w-20 is running with 5w-50......and all is good!