R33 progressive springs

Your oil is too heavy.

Will it damage anything like the valves?
Ive been using 20 weight for 20000klms. I got the dealer to put the Progressive springs in with 20 weight oil and they were sceptical,but their mechanic reckoned all was good after a test ride.
The front suspension works perfectly on any surface.
 
Does anyone know if anyone makes stiffer fork springs than progressive suspension? There were no spacers or anything else just the springs when ordering from progressive. Way to soft for my application.
 
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