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Seems Öhlins typically specifies '2.5' viscosity. I call 'em "dampers" but to each his own. There are other thicknesses from which to choose as well. Happy motoring.

Even on 'new car' finishes as evidenced by our local car dealers' inventory lot. What do you like to use to treat it?

They're about as grippy an offering as you'll likely currently find from 'extreme performance summer' compound and construction tires. Hot, fresh and sticky like few others...if you're into that kind of criteria. Ran 'em at El Toro MCAS with POC during December so their so-called summer...

Our 1996 Miata MX-5 1.8L with ~105,000 miles. Apart for preemptive timing belt renewal (although it's a 'non-interference' engine), water pump, crank and cam seals. Steady diet of annual OCIs with M1 0W-40 and Fram Ultra XG7317. Virtually zero oil consumption between changes. Spins to 7000 rpm...

From our '17 Boxster S with ~10,000 miles. Clever and tidy packaging to trot 350 horsepower from 2.5L but somewhat limited access. OE (and replacement) filter manufactured by Wix-Filtron in Poland. Charge air cooler sourced from Czechoslovakia with spark plugs from Japan. Its tires are French...

ACDelco vs Fram 2011 GMC 5.3L Sierra with ~51,000 miles. Mileage had passed such that another air filter replacement was scheduled per factory recommended interval. Presented is a visual comparison of its original equipment ACDelco #A3086C, conventional Fram #CA8755A and Fram “Tough Guard”...

From Engine Professional Pages 48-52... http://www.aera.org/ep/EPQ3-2014/index.html