Hi,
Sdfx - From the Caltex-Chevron prototype Workshop I ran In Copenhagen in the 1960s we serviced a Fleet of Hire Caddies. These ran all over Europe on hire to US Service people. We ran 10W-30 in these and the cars were virtually trouble free over very long
distances
With SAABs many problems occurred when they introduced the V4. Underneath, and because of the drain plug locations many gearboxes were drained in error and the engine overfilled with engine oil! This was quite common initially especially those familiar with the two-stroke version!
That said, the Ford V4 engine loved 10W-30 too
I would run a good quality 10W-30 in both engines - I speak with experience
Sdfx - From the Caltex-Chevron prototype Workshop I ran In Copenhagen in the 1960s we serviced a Fleet of Hire Caddies. These ran all over Europe on hire to US Service people. We ran 10W-30 in these and the cars were virtually trouble free over very long
distances
With SAABs many problems occurred when they introduced the V4. Underneath, and because of the drain plug locations many gearboxes were drained in error and the engine overfilled with engine oil! This was quite common initially especially those familiar with the two-stroke version!
That said, the Ford V4 engine loved 10W-30 too
I would run a good quality 10W-30 in both engines - I speak with experience