dino oil and ZDDP additives ? anybody

Conventional oil and ZDDP additives. Who using them? What are you using( Oil/ additive)?
Hows it working out for you? Intested budget oil (less than $6.00 a Qt)
I can buy VR1 for about $6.00@ QT...= 30.00 per oil change
or I can but dino about 2.50 @QT (on sale) + ZDDP = 21.00 per oil change.
Is this a bad idea?