I'd say you have to match your shock oil to pistons and springs so you could really run any weight of oil assuming the spring and piston compliment the oil.
Running thin oil and a small piston may give the same static feel as thick oil and large piston when you compress the car on the bench but it will give a very different feel on the track.
At the moment I am favoring:
Front:
37.5wt
3 hole 1.45mm tapered piston
blue spring
Rear:
27.5wt
3 hole 1.55mm tapered piston
yellow spring
On a grass or astro track.
As a rough guide I would generally run anything between 30 and 40wt in the front with either a 4 hole #55 piston or 3 hole 1.45mm tapered piston on green, blue or black springs.
In the rear I've tended to use 25wt to 32.5wt with a 4 hole piston with 2 holes #54 and two holes #55 or a 3 hole 1.55mm tapered piston on white, yellow or pink springs.
I guess at the end of the day providing it's working for you it doesn't really matter what you run.
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