i just bought an eg with an ls motor in it, the b18b1
its running about 7 lbs of boost
supposedly the motor has around 35k miles
he told me that he only ran mobil 1 synthetic oil and thats all i should put in it

my question is: is it necessary to run synthetic oil in this motor?

i was going to change the oil because its low and black plus i dont know when it was done last.
my other b18 takes pennzoil conventional pretty much every time and its never been a problem.
im just wondering if swapping from synth to conventional might cause any issues with the engine

your thoughts?

 

if you want to switch back you need to do a motor flush.. you can buy that stuff from the same place you get your oil usually.. follow the directions

BUT

It is recommended to use only synthetic oil in a turbo application because synthetic oils are better at resisting thermal breakdown then non-synthetic oil, and we all know that turbos run at extremely high temperatures.

 

i dont know why i didnt just search this instead of making a post
theres plenty of information already about it and search has never failed me before
thanks though