99 V6 oil ?

[03cobramanIII]

ok my wife has almost got 90,000 on her car , i been running reg. mineral oil since i got it with 60k on it.

im fixing to change the oil , is it to late to run full syn. oil now?

it does not smoke or anything .

 

[Stangcharger]

ok my wife has almost got 90,000 on her car , i been running reg. mineral oil since i got it with 60k on it.

im fixing to change the oil , is it to late to run full syn. oil now?

it does not smoke or anything .

it's prolly not to late, but why switch?

Honestly if it is running good on regular oil then stick with that. I run synthetic in my built motor, but in my daily driver i run regular.

I like valvaline for regular oil and mobile 1 for synthetic.