Here's a good read......
https://newsroom.aaa.com/2017/06/aaa...-oil-changes/#
I use Synthetic or Synthetic Blends depending on the application. There are plenty of studies that show for a few extra bucks the benefits far outweigh the difference in price.
If you use conventional oil and follow the recommended maintenance schedule, you won't have any problems.
But when you are using an engine for "sever duty" applications, which I include as most motorhomes.... and even generators when temps are 90 degrees or higher.... the exra money for synthetic is worth it.
I can do a 12 quart oil & filter change for my SV34 for $80. The Ford sealer chargers $110 for conventional. Why wouldn't I use Synthetic for a 10-ton motorhome when I can do it for less? There's no downside.
I just changed the oil in my QD6000 last weekend and used Shell T5 15W-40 Synthetic Blend that met the Onan specs.
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