2004_mustang_gt

I was what type ofoil helps the mustangperform best, or doesteven makethat big a difference? AlsoIput10w 30in my 2004 mustanggt,whatoilwould be best? thanks

sprostang

Mobil 1 5W20

timeformiller44

um your mustang requires 5w-20 please dont put 10w30 back in, people say that dont matter but it does...at the dealer ive seen motors go bc of the wrong weight oils being used....use either 5w20 mobil 1 full synthetic or Royal Purple...i dont use anything but...and my car is running awesome...but they do say royal can show a little numbers..

bjh061487

very small numbers but royal purple does add some performance... and the thickest oil you should put in is 5W-30 in the summer and back to 5W-20 in the winter

timeformiller44

i never said a lot of numbers, just i heard it was...and u should use 5w20 all time...im a tech i know..lol

FDNYBullitt

The bearing clearances in our motors are very tight. This is why Ford states 5-20. I use Mobil-1 or Royal Purple and all is fine. Using a 10W anything won't help, good luck.

racer02GTstang

yes, make sure you use 5w30 or 5w20... for summer, you could use either... but make sure you have 5w20 for winter... i am going to run non synthetic 5w20 castrol or penzoil during motor break in but once its good to go, the mobil 1 will be back in...

racer02GTstang

ive also noticed the motor runs slightly cooler with non synthetic.. its just something i noticed but i have put it in 3 cars and the needle is about 2 needles cooler in all of them...

SmallFeesh

Since I got my handy dandy manual out I can quote here like I did the gas! Yay!

"Use SAE 5W-30 motor oil certified for gasoline engines be the American Petroleum Institute (API)"

"Do not use supplemental engine oil additives, oil treatments or engine treatments. They are unnecessary and could, under certain conditions, lead to engine damage."

Notice Ford does not say "use this for winter and this for summer" Ford says "Use 5W-30" always!

I use Motor Craft 5W-30 Synthetic Blend... it is cheap.. made by Ford... and unless you have a highly modded high HP motor anything else is just plain not needed! When I throw on the ProCharger I will switch to Royal Purple!

If you want to upgrade oil go with Royal Purple! Good stuff!