This is a common problem on hydraulic lifter engines. What happens is that the oil in galleries in the engine drains back into the pan, and then the air is forced into the lifters when you start it up. Then they have to pump back up. Some engines have anti-drainback valves built into the oil filter, but a 235 wouldn't. I think there are some mods you can make to the lifters to help bleed off the air but I can't find the link I used to have.
Early Miatas were notorious for this problem. Sometimes a different brand or grade of oil helps, sometimes not. Its not really destructive per say, but it is embarassing. Adjusting the valve lash might actually help somewhat.
Last edited by 4ontheFloor; 11/28/2007 12:51 AM.
