Got my 100k tune-up and the car ran great. Just got a valvoline oil change and wtf? Car is not right! I think I got the basic 1020? Could that be because i didn't get 75k oil or or is valvoline not a good idea?!?!

 

What all was done with your 100K tune up? I doubt oil would do anything, but more likely ignition components like spark plugs/wires, etc.

Can you give some more details about how the car is running.

 

Car is screaching during warm up (not common on this car) and seems to be shaking more through lower speeds. I also checked tire depth and it is ok although valvolineinflated to 32 PSI for all. I usually keep it around 30.. It was running very smooth prior and it just seems to be (sound) like it is working a lot harder now then it did in getting up through the lower end speeds @ 2-3k RPM's.

 

you need to specifiy what was done at the tune up...

 

I agree, need to know all that was done to the car, and where you had the work done (ex. dealer, local shop, etc...)

 

Tire inflation info is printed inside the driver side door. Screeching is likely to be from the belts .... perhaps replaced improperly.