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I'm pretty sure there is no "optimum" size but there are optimal brands. The OEM LS400 is highly recommended. I forgot the brand but it was green writing and an 84 month warranty.
That's what I was thinking. Some people are saying I can use the 35 or 24F. The difference in size is so small, I can't tell which one is correct OEM size. I guess I'm gonna get me at Toyota 84 month.
