Originally Posted By: Dyoel182
I'm buying the car for sure so I'll check the glovebox manual asap and see if it lists different weights for climate or just the single 5w30. I'm thinking with 4ish quarts of 10w40 and 2 quarts 5w30 it would be fine during the texas summer.
Maybe better mix with 2 qts 5w20. I didn't think of that before because Maxlife 5w20 is hard to find, but you could use any brand for 2 qts. While 10w40 would work fine, I am just not a fan of going extra thick. Maxlife blend 10w30 performed wonderfully in my 460 V8 motorhome on a 5000 mile trip in 100+ F weather through AZ, UT, CO a couple years ago. I believe it (or a 10w40 5w20 mix) is up to the task you have at hand.