I’m a big fan of Blackstone Lab’s oil analyses. I run them on our diesel powered Sprinter Van, as well as on our Ranger Tug 31’s Volvo engine and transmission. The mechanic that worked on my R27 (who, sadly, moved on to a much higher position and better pay for a mega-yacht dealer in Chicago), did oil analyses for me through the local Cat-Petersen dealer. They were cheaper, but bare bones. Just gave the metals percentages. That all made sense to my mechanic, but me . . . I need someone to explain it. Blackstone does that.
Our 31 is newer, so I have only one analysis on the engine, and one on the transmission. I ran both at about 156 hrs in January, before the 200 hrs specified. I did it at that point because it was after my more intense winter usage (Christmas Ships parading) and before spring/summer boating. I also ran the tests at that point because the Volvo service specifications had been posted to change the oil/filter in the reverse gear (transmission) at 25 hrs, where the only spec I had in the owner’s manual when I got the boat was to change the oil and filter at 12 months/200 hrs. I wanted to test right away, In case I had any issues caused by not changing the oil/filter sooner.
What I like about Blackstone’s reports is what Brian (BB marine) mentions: they maintain the records, give you a good narrative, and are there to talk to you by phone and answer questions if you have them. As an example, here is the “narrative” that came with my transmission analysis report:
Things look pretty good for this ZF.Typical wear is in the universal averages column, taken after ~175 hours oil use. Your metals mostly match up well with those benchmark values, even with wear-in still in the mix. The only metal that's higher is lead, but it just looks like harmless oxides washing off a new part(ex. oil cooler). Note the 0.1% insolubles, showing that solids were building up, so it was a good time for the oil change.We don't think you'd have any trouble sticking with this interval in the future, but following Volvo's protocol would be a fine choice too.
I told them in advance that the Volvo transmission is a ZF model, that the analysis was for an essentially “break in” oil with 156 hrs on it, and that Volvo’s spec had gone from 12 months/200 hrs to 25 hrs for a FIRST oil change, with 12 months/200 hrs after that. I was extra curious about any problems in the oil given that change to 25 hrs for changing the break in oil. Their take on things was very reassuring. For what it is worth, I plan to run another analysis on both the reverse gear and the engine as soon as I have 50 additional hours on them (which should be soon) and get Blackstone’s take on how the oil in each is holding up.
The narrative Blackstone provides is part of a more detailed report that goes through metal elements one by one (compared to averages for your engine/transmission), plus other values (like water %, antifreeze %, other insolvable %). Those undoubtedly would mean a lot to others, but they don’t tell me a lot. I rely on the narrative that Blackstone provides.
Blackstone’s analysis charges are not the cheapest. But their substantive analysis is heads above anything else I’ve seen, making the expense well worthwhile. Plus, giiven what I spend on other things for the boat, the cost is almost negligable. And if I were buying my boat used, and the owner could produce these, I’m sure I’d be willing to pay enough extra to more than make up for the cost!
Gini