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Registered
Join Date: Mar 2019
Location: Saarland, Germany
Posts: 1,254
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Stay with a non-synthetic and all mineral 20W50! If the Valvoline is no more available, choose another brand, but stay with viscosity and klthe mineral/petroleum based oil. Also stay away from semi/partly synthetic oils too.
(Partly) Synthetic oils do not let swell rubber sealings as all pure-mineral oils do by nature. Therefore the synthetic oils need elastomer sweller additives. The problem is that todays synthetic oils mostly do not contain that much of them as required in an aircooled 911 engine with a lot more rubber sealings than a conventional inline or V engine has.
Will say - if you switch to a synthetic oil I expect your engine will start leaking oil...
Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL.
Last edited by Schulisco; 09-28-2024 at 05:49 AM..
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