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He's probably in northern Florida. I was there in January without a jacket. Big mistake. It was cold as heck in the morning and late evenings. It's not all sunshine in that state.
GRAND, lol.....forgive me but it says your in Florida How cold does it psooibly get for you to need the 5W 30 grade? Just asking is all.
I stay in northern cooler area's a lot, and it gets to lower 20's often at night (not anymore). Not to mention, I’ve noticed it was easier to start the car with 530 on my previous cars (cranks faster), so I just got used to switching between the winter and summer.
Anyhow, I rather use what the factory suggested, but summer time does not offer much forgiveness to keep the factory recommended grade.