Procedure in Going Full Synthetic

[yuko3n]

I currently have dyno oil and want to go full synthetic, Mobil One, do I have to flush the system, if so, how? Also, I was told if you go synthetic
you can't go back to dyno oil because your seals will go bad, is this true?

[2000CAYukon]

Never heard of the seals going bad switching from synthetic back to dino oil. Typically, synthetic will find leaks that do not occur with dino oil.

I did not flush when I went to synthetic. Just do a normal oil change and fill with Mobil 1 and you will be fine.

//2000CAYukon

[pbsfolks]

FYI; synthetic oils will leak where regular motor oil wont due to thinner viscosity. ..........Mike

[2kflhr]

Originally Posted by 2000CAYukon

Never heard of the seals going bad switching from synthetic back to dino oil. Typically, synthetic will find leaks that do not occur with dino oil.

I did not flush when I went to synthetic. Just do a normal oil change and fill with Mobil 1 and you will be fine.

//2000CAYukon

That's the way I did it and everyone else I know. I heard the same complaints about leaks beginning when changing. I changed my Harley and the wifes car and no leaks.

[eljones247]

Originally Posted by pbsfolks

FYI; synthetic oils will leak where regular motor oil wont due to thinner viscosity. ..........Mike

NEVER! 5w-30, or what ever oil your using, is a rating. It will perform exactly the same as old school oil that is rated the same. (If they both carry SAE logo).