I have twin 1997 5.7 EFI Crusader engines with Velvet transmissions. Engines have enclosed cooling. There are 525 hours on them. Maintenance records are sketchy. Records at previous marina show storage and annual maintenance performed. No other details. Based on this unknown I am looking for advice on what to check/perform. My new to me marina did annual before heated storage with no previous records. They changed oil and Recor fuel water separator filters elements on engines and generator. They did not change transmission oil, check coolant chemistry, or change the secondary fuel filters at injectors?

I have purchased the Crusader engine service manual, parts manual, and training manual for diagnostic information. A CodeMate was also purchased.

I was spoiled with a great mechanic/tech for most of my 350 I/O boating years. He got the boat in October, looked at hours and made recommendations base on great knowledge and good record keeping. He is no longer available.

Let's say I feel like a dog who caught the chased car. Now what? Are there recommendations on picking your battles? What should be done dry, what should be done in the water. What is critical to do prior to season use? What can be done as a" get to " during season.

Any help would be great. Dan