arens

I use Mobile 1 or Penzoil synthetic, whichever I can get cheaper at oil change time. The only constant is the WIX oil filter. I have 70k on my daily driver and 80k on my wife's. No issues with changing oil brands.

I have only had my Mustang for about 5 months so far. It had about 155k on it when I changed the oil and went to a synthetic. According to the previous owner he was using valvoline dino. I have less than 1k since the oil change but there are still no leaks.

sn95red94gt

do you guys thinx my car which has (77k) on it will have any leaks gaskets etc.?

94StinkinLincoln

should be alright. cars now days have VERY tight clearances inside the motor, too thick of oil and at start up when the oil is cold will not get betwen the bearings like they should and kiss it goodby. seriously you only need like 5psi at idle, thats using thin oil, its not uncommon today. if you do see leaks with synthetic, just go with a blend. we use the blend at work, i think its 5w-20.

TTGreenSN95

i had no leaks until i went to synthetic now my rear main seal is leaking im going to try the blend and see how that works my car has 85,000 miles on it........

Detroit_Muscle

I just bought a 91 gt with 60000 miles and first thing I was told to do was to use Mobil 1. I did and no leaks.

Curlytop

i use mainly castrol syn. and have try the royal purple. didn't see a big difference so went back to castrol. love they product use it in all my vehicles. plus big daddy john force uses it too. lol

98MustangGT46

Yea i use mobil 1. I ve been using it for a couple years now. No problems. My 2000 Dakota R/T had 115,000 when i sold it and i used mobile 1 synthetic on that too. My car has 101300 and i use the synthetic.