The vehicle is a '71 Buick LeSabre with a Stage 1 455cid V8 that was rebuilt about 5,000 miles and 8 years ago, and hasn't been driven in the last 5 years. I'm getting it back on the road within a week or so. The 455 was built on purpose with the bearing clearances on the tight side (.0015 max on the rods and mains), and has a high-pressure/volume oil pump with the pressure regulator currently set at 50psi max. I've been using Rotella T 10-W30 with AC Delco filters (NOT the [censored] Frams that let all the oil drain back into the pan). The cam is a TA212 hydraulic flat-tappet, specs are: Intake .470"-218' / Exhaust .475"-230'. Valvesprings are stock Stage 1, iirc 115lbs pressure at .5" I Live in West Texas, and the car is retired from a daily driver. I'll mostly drive it on weekend cruises, some long trips and once in awhile to the local 1/8-mile track for test-n-tune. I drive it easy until it's warmed up and don't drive it like my hair is on fire, although I do like to open it up on long roads and at the occasional stop-light. I'm guessing I'll be changing the oil once a year, at 3-5K miles? I have no preference on conventional vs. synthetic, but I don't want to order online. What say ye all?