I have been putting crap Autozoo Coastal junk dino in my SDL for winter storage...never had a problem. Come spring I drain it and refill with Amsoil or Mobil Delvac 1.

I do it for $$$$$. Synthetic oil costs me about $50 for a change, cheap dino is $20. Since the car is just sitting, the oil doesn't really matter. I put maybe 5 miles on the dino oil every spring, between moving the car out of the garage, and taking it for a ride.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200