0w20 vs 5w20 in hot weather
Which oil is better for hot weather like in Florida
interesting thing is that this hyundai in other countries manuals says to use 0w20, 5w20, 5w30, 10w30 and 0w40, all depending on temps car will be in. In usa they want you to use 0w20.
This question has been asked 100's of times on BITOG; seemingly weekly if not more often.
0w or 5w
winter multi-grade ratings don't come into play in Florida so you can ignore that basic aspect.
Since you have not mentioned an engine, I will speak in generalities and from experience.
A
quality 0w20 such as M1 0W20 EP will likely outperform a lower tier 0W- or 5W 20
Overstressed 4 cylinder engines might benefit from a increase of HTHS by moving to a 30 grade lubricant
such as a quality synthetic 5W30 or a preferred 10w30 that may reduce the VM treat. A modest but effective one-step increase in HTHS or KV100 will not compromise an engine - even one with advanced timing and pumping systems - if it is operated in moderate climes. VM used in high VI lubricants are F.E friends but sometimes not particularly "protection" friendly.
The question maybe to ponder now, though one with many differing answers, might be, "which quality lubricant should I choose?" - Ken
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Extra discussion. Many 0w20 have been formulated to a high viscosity index (VI) to provide a somewhat improved warmup regime F.E vs a 5w20 or 5w30. Many demonstrate an appreciably lower kv40 than their 5w brethren. I would call - wrong or right- a
commodity grade of this lubricant a
fragile lubricant.
Some KV40 (104degF) comparative examples:
Motul VAG 0w20:
38cSt,
Mobil 1AFE 0w20:
45cSt
Mobil Super 0w20:
43cSt - Mobil Super
5w20:
47cSt
Subaru (GF-5) 0w20:
37cSt
Are the VAG and Subaru (idemisu) lubricants above fragile? No, But they are demonstrably and substantially less viscous.