%synth %conv on AC Delco 5W-20 and 5W-30

[stchman]

My girlfriend's Malibu gets the oil change at the dealer for free (she bought a package and it includes 3 years maintenance). They use an AC Delco oil filter and AC Delco synthetic blend 5W-20 dexos1 oil.

My question is does anyone know the ratio of synthetic to conventional in AC Delco dexos synthetic blend?

 

[Brybo86]

I'm gonna guess 5% grp III synthetic
What is her typical oci? I'd change it as soon as they would let me.

 

[stchman]

Originally Posted By: Brybo86
I'm gonna guess 5% grp III synthetic
What is her typical oci? I'd change it as soon as they would let me.


The dealership wants her to change it every 4K miles.

IMO, that's a bit soon, but if they're going to do it that often, let them.

 

[barlowc]

Originally Posted By: Brybo86
I'm gonna guess 5% grp III synthetic

Really, only 5%? Or did you mean to say 50%?

 

[RamFan]

Minimum of 30%ish if I had to throw out a number.