Service writers are typically worthless. Talk to the Service Manager. I did befriend a good Writer a few years ago recently at the VW dealer near me, I think even he was getting tired of the poor management and passive abuse of the service and parts side.Just out of curiosity, I asked my dealer service advisor if he would put in a 30 weight oil (because I was planning on towing in the summer heat) when I came in for a toyota care interval. He said it would most likely void my warranty but he would have to check on it. I would have to sign a waiver at the very least because the "oil passages are very narrow and it could cause oil leaks" LOL! Daddy government got them all gaslit pretty good!
Back when Subaru was pushing using only their Genuine synthetic oil (Idemitsu USA which is very good BTW) We had an argument over using conventional lubricants; that "Synthetic" was not a specification in any way, I showed him a "hidden" statement in the O.M. about using conventional.
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