Dry wrote:

Other than oil, is there anything that I can use to keep the teak
looking it original color?


You can apply a polyurethane varnish that is as colorless as possible,
but there will be a little color change. But then you are locked into
the varnish/revarnish cycle. Another problem with varnish on teak is
that it gives the wood a sheen that is kind of unnatural for teak.