LDCristHi LDCrist, in my experience, it's not a good idea to put wood in the dishwasher. However, if you want to do this, I recommend rubbing the wooden handle with mineral oil, or raw linseed oil (not olive or vegetable oil). This will impregnate and protect the wood from getting dried out and cracked. It's a good idea anyway, as it will reduce staining from things like turmeric. (Adding any kind of oil will cause the wood darken a couple of shades. )
LikeWowScoobsI just use Canola on teak kitchen stuff (and that's what the manufacturer recommended). I think there's a lot of folklore out there about rancidity, drying. For inexpensive kitchen items just use whatever salad oil you have, don't use too much, and if anything goes wrong, chuck the thing out and buy a new one. Us geeks tend to overthink things.