Right now I use syn. Havoline 5w30. What should I use for maximum engine life?

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Pretty damn smart with cars for 17!
91 Camaro RS, 305 TBI
No mods yet...Hopefully:
Convert to dual-cat with headers and Borla catback exhaust.
Edelbrock MPFI system.
RAM air hood & Z28 wing.
Z28 cam.
ABS system.
Positraction rearend with rear disc brakes.
Rebuilt front and rearend suspension with polygraphite bushings.
Strutbrace.
Rollbar.

 

syntec will help extend life,personally I stick with 10-40,where are you in VA?

 

The best kind of oil is clean and fresh.

Next, synthetic.

Your choice sounds entirely suitable to me. My preference for weight is basically the thinnest thing that still holds high pressure, so I use Mobil1 0W30 or if I can't get that 5W30.

You should put synthetic in the other palces in the car too, especially the rear end. That's worth a couple of miles to the gallon sometimes. If you do that don't forget the pos additive, in fact you might want to put in 2 thing s of it because the synthetic oil seems to need it more.

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"So many Mustangs, so little time..."

 

when you guys drain your oil, how much do you usually get? like after the filter is drained and whatnot
thanks