I have a Dohc 94 and I belive that my cam and or followers are making a clicking rattling noise at startup for about 10 - 15 seconds and a substantialy less amount of noise during some driving conditions I was running 15w 40 which solved these problems for a while but when they returned i swithced back to a 10w 30 at my last oil change because i havent been driving her as hard and i was hoping to get a little better gas millage i know that it is a cardinal sin to do that but im just trying to solve this problem cheeply and figured they werent getting enough oil, what are some other possibilities?