hi, i have a 2006 nissan altima 2.5S.....after having a tune-up, my engine has been make this werid noise.... like oil is not coming up fast enough when i start the car.....i have checked oil stick and its on full...... is there a special engine oil or it the regular engine oil every car uses..... PLEASE HELP..... DONT WANT TO HEAR THE NOISE EVERYTIME I START THE CAR.... THANK YOU.

Next oil change (or now) use a Nissan oil filter. After market oil filters have a tendency to do that.
I used an after market oil filter once on a '95 Altima I used to own (4 Nissans ago) and it would rattle in the morning until the oil pressure came up.
That was the first and last time I used an after market oil filter on my Nissans.
Funny. After market filters work fine on my GMC truck.

Good luck!