[neallewis]

Originally Posted by Welshy40

I just look at the associated bottles as they have both values on the bottles. These are whats on some ive got from online.

22.5 is 238
27.5 is 313
30 is 350
32.5 is 388
35 is 425
37.5 is 463
40 is 500
42.5 is 538
45 is 575
47.5 is 613
50 is 650
55 is 725
60 is 800

Yes this is exactly right. The AE bottles WT scale is not linear and does not directly translate to the newer ISO linear standard. They therefor offer both scales on the bottles which is nice of them.
I'm also unsure on the older Losi scales, but suggest its also not quite linear to match CST as with AE.

One thing I've noticed is that some oils (core rc) do not seem to match CST scale that others use. They are a bit thinner for the same CST rating, and much more subject to temperature variation.

Whichever brand you use its always best to stick to the same brand to ensure consistency of the ratings through the range.