Newly acquired 2AZ-FE. 180K miles on the clock. No clue if it was fixed by Toyota or not, all I know is it was in for a consumption test (don't even know the results, just know the test was performed - these were Toyota's words). I know these have bad rings and are notorious for burning oil like crazy. I plan to change the PCV valve immediately as a precaution. I'm debating what oil would be the most beneficial. I know that no oil will fix bad rings, just looking to choose the best option under the circumstances. Note that this will be slightly short-tripped (6 miles 1-way) in-town most of it's life and the owner can't drink yet & has a lead foot. I'm just looking for the best of the following answers, as these are the oils I already have plenty of on hand for pennies on the dollar:
A. Mobil Super Synthetic 5W-20
B. Mobil Super Synthetic 10W-30
C. Mobil 1 HM 5W-20
D. Mobil Super HM (blend) 10W-30
E. RGT 5W-20
F. RGT 5W-30
G. Mobil 1 Truck & SUV 5W-30
H. Mobil 1 Truck & SUV 5W-20
I. Mobil 1 Truck & SUV 0W-20
I guess my two key questions are...
1. Will the cat be better off with synthetic over a blend? My guess is whichever burns less, which both should be about the same...
2. Will a XW-30 help or hinder the specific issue with the 2AZ-FE versus a XW-20? More specifically, will a lower viscosity help the oil problem or the other way around?
My initial thoughts are to use D, because it's the cheapest/most plentiful oil I have, I think a XW-30 may help consumption, and ultimately it's going to burn no matter what...