'99 Saab 9³ 2.0L turbo, just finished 11,000 miles on 0W-40 with filter changes at ~4,500 & ~9,000 miles, & A-Rx from ~9,000 to 11,000 miles; after A-Rx rinse I'll run 5W-40 for ~9,000 miles & probably do a UOA & filter change at ~4,500 miles (for comparison against 0W-40). Assuming it shows OK, I'll run all subsequent 5W-40 OCIs for 10,000 miles & I won't do any mid-OCI filter changes after that.
'90 Saab 900 16v 2.0L N/A, just finished 11,500 miles on 15W-50 with filter changes at 6,500, 8,000 & 9,800 miles, & A-Rx from 6,500 to 11,500 miles; after A-Rx rinse I'll run 5W-40 for 20,000 miles with a UOA & filter change at 10,000 miles.
'85 Saab 900 8v 2.0L N/A, new purchase & currently in A-Rx cleaning phase; after A-Rx rinse I'll run 5W-40 for 20,000 miles with a filter change at 10,000 miles.