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On the 10w-60s, I know people have run them in 944s before, often in the turbo model. Porsche specifies 10w60 for the later aircooled cars like the 964 from what I know. Castrol seems hard to find here but Liquimoly and Motul both make options which are readily available. They would probably...

For whatever reason, I don't see the Jugs of VR1 or any synthetic VR1 being sold up here (Napa used to but seems to have stopped carrying it). I wish I could just order from the US, but shipping costs on automotive fluids seem to get pretty outrageous (probably due to the weight).

Thanks for the explanation @GI_GRIFF ! So far I've narrowed down my options based on recommendations from here and what is readily available. I've priced everything out in $CAD for what an oil change on my 944 would use (~6L) Conventional: Valvoline VR1 20W-50 $84.73 Castrol GTX Classic...

On the A40 thing, Porsche's service bulletin seems to say not to use it in classic vehicles. They don't give a reason why though

Another point of data, on some older forum threads, I've seen people claiming to run the 10w60 synthetic that a lot of BMW M cars have specified without issue. I vaguely remember reading on here that it shears down to a 50 weight relatively quickly, but I wonder if more knowledgeable people than...

I know 944 engine builders/mechanics that I've talked to seem to suggest the viscosity on a modern Xw40 is likely too thin at operating temperature but I would be interested to see if there is a reason I can get away with that lower viscosity. The main concern I've seen about w numbers much...

I've got an '85 Porsche 944 as a project car that I've been running 20w50 Valvoline VR1 in without issues. But, getting bored while the car is in storage, I figured I'd ask people who know way more about oil than I do if there is a better option I could try. This is mostly for my own curiosity...