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It has about 3100 miles on the oil since I changed it last January, it's medium-brown, and I have to turn the dipstick and squint to see where the lighter-colored oil at the top is on the stick (IOW, it's not much darker than fresh out of the bottle). The engine doesn't leak or smoke, and the oil stays clean-looking. I'm still using my stock of ACDelco PF35 filters, and I change the filter once a year with the oil. I've been doing oil changes yearly since retiring it to "pleasure" status, and if I remember right, what's in it now is a mix of what I had left of Mobil 1 10W-30, and SuperTech conventional 10W-30. Now I typically drive it about 30 miles to work and back one day a week, and on weekends, so it gets 50-100 miles on it a week. Early in the engine's life I used Pennzoil 5W-30, and then I switched to Mobil 1 to try to extend the intervals because I was driving a long way for work every day. What I've always wondered, though, is how much (if any) damage that event caused.Īt 50K miles on the engine, it uses a quart in 1500-2000 miles. We recognized the problem (hard to miss - the engine didn't run well) and didn't drive it until that problem was fixed, and immediately changed the oil and filter, because I know gasoline cuts oil. My only concern is that after swapping the old worn-out 305 for the 350, a mistake was made - one of the new, larger injectors ended up crooked in the injector pod, and the resulting gasoline leak put a lot of fuel into the crankcase.

I'm on pace to put 4000-5000 miles on it this year. I've been changing the oil and filter approximately once a year. It never freezes here, and once a year I take it on a long road trip (about 900 miles) in the middle of August, when it's typically 105 F in the middle of the day. I typically drive the vehicle once a week, even in winter, and I take care not to short-trip it - I don't drive it if it's not going to stay at operating temperature for at least 10-15 minutes.

I did the conversion from carburetor to TBI myself on the 305 it replaced, using GM Camaro/Firebird components. It has a Crane 2032 roller camshaft, nothing radical. I have an '87-and-later style (one-piece rear main, center-bolt valve covers) TBI 350 in a mid-80s El Camino.