oil

[SBTork]

I ran valvoline durablend (synthetic blend) in my '86 for a few years then switched to Valvoline fully synthetic, then gave royal purple a try. For my money, i'd go back to durablend or valvoline fully synthetic. I did not have any problems with royal purple, im just not convinced it's worth $8/quart.
That and a good PF35L, high effiency ac delco filter or a K&N performance gold oil filter.

[b454rat]

I use Castrol, but if you change your oil regularly, I think any oil would be fine. I had a 400 that had 200k+ on it. I drove back and forth from Bing to Ottawa, put 60k on the motor before I left. The motor was a sludgepit on the inside. Changed the oil roughly 3k, and when I tore the engine apart, it was virtually spotless. I think any oil is fine, I kinda think they are all the same just different color bottle. Never used synthetic and dont' plan to.

[Malo83]

205K on my DD 83 305, Run 10/30 Pennz High Mileage with a FRAM 2 qt filter and have been running this since day 1 , I do 3K/3mo oil changes, Synthetics aren't in the picture until I have to replace the engine

Use any oil you wish,all oils today are about the same, it's mainly Brand loyalty, use one oil and stick with it

http://www.bobistheoilguy.com/forums...Board=1&page=1

Some of these guys can be a little ANAL about oil but still a good place to visit.