I've been using Castrol GTX Classic 20W50 per Marco Mansi's recommendations.

Andrew

On Mon, Sep 30, 2024, at 9:22 PM, Jeff Palmer wrote:
> I’ve been running synthetic in my 2.1 Boston Bob since I had it 
> installed about 15 years ago. Before that in my old 1.9 I would run 
> 20w/50 from spring to fall before it would get parked in the winter. 
> Wondering what weight I should use for synthetic with temps ranging 
> from about 15C (60F) to 35C (95F). I believe my garage has been using 
> 15W/40 but wanted a third opinion :)
>
> Thanks
> Jeff
> 85 Westfalia GL on engine #2
> Sent from my iPhone