Cold engine noisier with Pennzoil Platinum 5w30

[PT1]

I have the same issue with my GMC 6.0L with 5w30 PP or M-1. So I am running 50/50 mix of 5w30 & 10w30 to get a 7.5w30 which ,my engine seems to love and the start up noise has been reduced to a minimum. This issue happens with my vehicle under 50 degrees only as I just returned from Florida with a full fill of 5w30 (just to see what would happen) and had no cold start noise there. My GM engine buddies tell me it is the expansion rate of the engine components (pistons mainly) in addition to the base oil weight. They recommend a 10w but GM wants to get max fuel economy so the engines are speced for 5w. My 7.5w30 does the job as it seems to cling on longer than the 5w and reduce the cold start clatter/tick etc.

 

[hominid7]

According to the spec sheets the penz platinum 10w30 is really close to being a 5w30, so i'm thinking in that specific oil the 10w30 is really the universal grade.

 

[Scout1]

I've got some of the Pennzoil Platinum 10w30 (the store was out of the 5w30 when I bought it) so I'll have to give that a go and see if I can tell any difference.

I've also got some Syntec 5w30 and some GC 0w30 I'm thinking about trying in the Honda. Dang... I need to get more miles on that car so I can try all these different oils

 

[posty]

Scout, what year is that 2.4? Is it specked for 5w-20 ? I have one in a CR-V that is quiet on start up but when is fully warmed up has that loud ticking after idling for a couple of minutes. Its not the valves, you think it is a solenoid ? I cant locate the source.