Is it safe for me to switch to synthetic oil? My 7MGTE has almost 162K on it and hasn't had a rebuild as far as I know. I've heard stories that switching to synthetic oil on an engine with this many mileage will either be bad for it or not benefit it in any way. Is this true?
Switching to synthetic oil
- Thread starter Eamon
- Start date
Your seals are probably too worn to seal properly and the only thing that's filling those gaps is the gunk from years of "dino" oil. Synthetic would clean that out...and then leak past your seals.
Im liking my 13.00 for 5+ quarts autozone brand oil 
7 oil changes so far using it every time and like it
7 oil changes so far using it every time and like it