"Thicker" "thinner"... this all twisted.
All XXw30 are the same weight at operating temp. That's what the last number means. The first number 5wXX, 0wXX determines the weight at start up. But here's a clue: all oil is over 100 times thicker at 32F than at 200F. They all thin out with heat. In fact, and I've said this before, Mobil 1 0W30 is THICKER at operating temperature than Mobil 1 10w30. So, the 0w30 is thicker at operating temp but pumps more quickly when cold. Read through the oil rant and the BITOG reference. This subject (oil) has more myths, more BS, more misconceptions than anything else on cars....speaking of which....
Thicker oil takes longer to get to rings? Yes, but in this case thicker/thinner is the first number. Causing more wear but less oil to be burnt? That's one of the most inaccurate things I've ever heard...oil is used/burnt because of wear. If you use oil that causes more wear, then more oil will be burnt. Period.
So, you want less wear on start up? Go with a 0wXX. Want an oil that thins the least in very high heat like the OPs country? Xw40.
Best of both worlds for him? Mobil 1 0w40. Look at my signature...take a look at what oil goes in the twin turbo V-12...an engine that costs twice as much as a new V70Xc. I run a 5w40 Mobil 1 in my T5 because I got it on sale for less than $1/QT, and I have the 5w30 Pennzoil Ultra in the XC because I got a similar deal, otherwise I run a 0w40 or 5w40 synthetic.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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