From a combination of rebates and closeout markdowns, I now have 5qt each of the "old" SN Pennzoil Ultra, the current Quaker State Ultimate Durability, and the "new" GTL Pennzoil Platinum (all 5W-20). So, there's my next 3 oil changes for the family Mazda 6. Any rhyme or reason to the order which I use these?
Assume approximately 7.5K OCI for each one. Current fill is an unintentional (long story) Castrol GTX that I will run for 4-5k. Prior to that it had been getting SM Ultra.
Assume approximately 7.5K OCI for each one. Current fill is an unintentional (long story) Castrol GTX that I will run for 4-5k. Prior to that it had been getting SM Ultra.