Im inbetween sythetic or reg oil for my L Is synth blend
a good inbetween choice or should I just go with one or the other?

 

never understood the reason for a 'blend' type of oil?

i've used/recommend mobil one since right after it came out.

i continue to use it in my 97 f150 & 97 grand prix.

am running royal purple race 5w20 synthetic in my L--like redline syn. too. having said all this, amsoil may be the best for our Ls?