Switch to synthetic you must keep using it?

[Rockford Fosgate Fan]

I was sitting around one day and started to think is their really any truth to old saying you cannot go from synthetic oil back to regular oil? I have always been told by mechanics that if you switch to synthetic oil and then switch back you will cause damage to the engine. I do not see how this is possible. Plenty of people buy new vehicles and switch from regular oil to synthetic oil. Then say four years later the vehicle is traded in or sold and ends up running on conventional oil again. So is this whole if you switch to synthetic stay with synthetic myth true or not?

Thanks,

Chris

 

[Dr_No]

FALSE.
BUSTED.
LIE.
NOT TRUE.
OLD MECHANICS TALE.
whole idea is B.S

 

[Turk]

Flip-flop it like a Crappie.

 

[speedyswede]

My motor would have gone KABOOM a long time ago if it were true.

 

[XPR]

You can switch back and forth..now why you would want to switch back after going synthetic is the real question.

 

[va3ux]

I've been back and forth so many times on mine that I can't remember it all. Absolutely no truth to it at all. Remember - conventional or synthetic - it's just 'oil'.

 

[meep]

15-20 years ago, was TRUE.

Today, No Longer True.

M

 

[paulo57509]

Originally Posted By: meep
15-20 years ago, was TRUE.

Today, No Longer True.

M



Why was this a concern 15-20 years ago?