QUOTE(technicalninja @ May 29 2023, 10:41 AM)
The viscosity of that oil at operating temp (100C) is 40.
The 0W is the viscosity at 0 degrees Celsius and that's not really correct.
It reacts similar to a 0 w due to additives that make it flow better at cold temps.
Personally, I'm not planning on firing or driving my 914 below freezing.
I see that as a 40w oil and would have no issues using it in almost anything that doesn't suggest a 0w/20 or 0w/16 (new stuff).
The whole multi-weight labels are a marketing ploy IMO.
I believe the standard viscosity test for automotive oils happens at 100C
This is from SAE J300.
The first number with a W behind it is a calculated number and has to be taken as such.
Now, I wouldn't hammer the crap out of the 914 with that oil in it from dead cold. I'd let it warm up to temp before spirited driving, but I'd do that anyway on any car with any oil.
My preferred oil for a 914 is the new Castrol GTX "Classic" that another member on here made me aware of. I ordered two 5 qt containers minutes after reading that post.
If I could get the M1 Euro at 20w/50 that would be my oil of choice.
I wouldn’t say preferred but having acceess to the Castrol just in case is convenient for several applications
Oil of choice I was told by my ( Volkswagen bus ) mechanic is gonna be brad penn ( for 914/ s ) not the bus’s “ cause it cost to much “