Oil samples can be a very helpful tool when trying to determine the condition of a vessel you desire to purchase. You should not overlook sampling the transmission and generator as well. Provides good feedback and data as part of a marine survey. Many of the oil sample labs and some motor companies provide some good data and educational blogs on this subject. If you would like to discuss what advantages I have found during our surveys, just call and discuss. 678.267.9877. We provide fast turn around on sampling and direct contact with the lab, if needed. Marine surveys Palm City Florida, Stuart Florida