Oil changes... once I have used fully synthetic oil do I have to keep using it or can I go back to semi?

Question

will this damage my engine?

Answer 1

It doesn't matter.  

Answer 2

its not recommended to switch back and forth, something about the engine seals swelling and the size of the molecules of the oil, you should be alright going back to a semi-syn though. for the cost of a 5 quart jug of mobil-1(fully syn) at walmart (20-23 bucks)thats all i'll ever use

Answer 3

you can go back and it won't hurt anything, but why?  you get better protection, longer change intervals and better fuel economy than conventional oil.  why go back?

unless you're using mobile or vavoline, in which case you should try castrol syntec.

Answer 4

It will not hurt anything as long as you continue to do your oil changes at a specific interval. Full synthetic is more slippery than a blend or regular conventional oil, which helps to reduce frictional losses and you get to use more of the power that your engine is capable of putting down. Personally I'd recommend something like Royal Purple, AMSoil, or Mobil 1. Just a thought.

Answer 5

you can go back to semi it wont hurt your engine  

Answer 6

you can go back and forth safely.  

Answer 7

As long as you have not used Fully Synthetic for a long time you'll be fine.