Survey and Laboratory Oil Analysis

[TaoJones]

I have a survey coming up the end of this month, and I have been asked by the surveyor if I want to have the engine oil, as well as the transmission oil, analyzed in a laboratory. There is a $50 charge for each analysis, and, as this is a catamaran, two engines/saildrives.

I can easily see the value of such analyses, and do not begrudge spending the additional $200, but I am hesitant for what I feel is a logical reason. That is, if the present owner has been diligent about changing the oil (he reportedly has been), and if he changes the oil just before the survey (I'm sure he will), what will a laboratory analysis reveal, other than the status of the new oil?

The surveyor has suggested that I should at least have the oil in the saildrives analyzed, as it is prone to the intrusion of seawater. That seems reasonable to me.

The engines are Volvo Penta 20hp units. I'd appreciate any insight from those more knowledgeable about diesels and saildrives than I am, which means everyone on this board.

TaoJones