Greetings, I picked up 9 gallons of this stuff when autozone was closing it out for around $12.00 per gallon. Anyway, I'm wondering which vehicles it can be safely used in. I'm a little bit worried about the phosphorous levels (poss doing . Damage to cat Convt.) the 3 vehicles: 1. 2002 suburban 5.3L flex fuel. 2. 2006 Buick Rainier 4.2L inline 6. 3. 2014 Buick Regal 2.0L Turbo. All 3 call for 5w30 I wanted to combine Mobil 1 0w20 with the tdt 5w40. In equal amounts to get a 30wt oil. Can this blend be safely used in any of the vehicles listed? Thanks