Since you're in such a warm climate, 15w40 is fine. I'm running 5w40 synthetic myself to see what numbers I get, but I'd not hesitate to use 10w30, 10w40, or 15w40 where you're at. If you're running synthetic it's practically a moot point.
You really don't need the 40 weight that much though since it gets warm but not really that hot there. Unless you're towing or mountain climbing.
I'm in California and have even run 20w50 year round since it only get down to 30 degrees here unless you head to the mountains in winter. That's too thick when you get down to 0 degrees though.
You can just as easily run 10w30 there as you could 15w40. I'd run both in your engine, measure the wear number and then use whichever one causes less wear. Unless you run synthetic, I wouldn't drop down to 5w oil though. It's just too warm there year round.
alan
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Originally Posted by Haoleb
Im planning on doing my own oil changes from now on and while looking through the paperwork from when i had my truck serviced with the 75k mile maintenance it says they put 8 quarts of 15w40 oil in there. Huh! Now i know it doesnt take 8 quarts, and i thought the tundra V8 uses 10W30 or 5W30.
I also plan on using Mobile 1 synthetic and Im not real sure if it would be better to buy the 5W30 or 10W30, The oil cap says 5W so I assume that would be best. But being in hawaii im not worried about the oil being too thick when its cold because it just doesnt get real cold. I have searched the arcives but never found anything real definitive.
I believe in the haynes manual it said to replace the seal on the drain plug, is this something that needs to be done? And where would i get one.
Thanks For the help. This might be beaten to death already but hopefully we'll get some good info for future searches.
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