Ok...I did just get back from a 6 day vacation, but my car is feeling slower this week...like 20hp slower.

The only thing I've done is:
1) I just got back from a 6 day vacation, so perhaps I forgot how fast my car was
2) I did an oil change about 3 days before I left...I've been running synthetic oil the whole time, but I switched to Mobil 1.

Is there a possibility this is a problem? I haven't seen any SES lights or anything. I put exactly 5 qts and changed the oil filter to Bosch (I was using cheaper frams before...)

Am I going nuts? I'm just not feeling the push in 2nd/3rd like I used to, or at least I think I used to.

 

Is it a lot warmer?

 

Push the car for a little while and then let it cool off and then push it a little again. I don't know why it happens, but sometimes the car does feel a little slower after resting a few days, but after pushing it for a while and then letting it rest and pushing it again it feels normal again... I think thats just our minds playing tricks on us.

 

Yeah, it hasn't gotten any hotter here in Seattle...we haven't even really got into the 70's too much.

I think I'm just going crazy. I'll just have to punch it in 1st on the way home and see if the rear end breaks out like it used to. If not, I'm going back to castrol. lol

 

Ever since summer mode took over in Miami the Z feels like it bogs a bit. Its been very rainy an hot so humidity is thru the roof. It feels consistantly less powerful right now. But even during the cooler time of year the Z appears to have slow days and fast days. I don't know why that is though.....................

 

I vote for weather, i know right now, if i push my car anytime other than at night when its cool, there is a significant loss in performance.