cfd95
Active Member
I would check the transmission coolers also.
When they fail you will see an oil sheen in the water.
When they fail you will see an oil sheen in the water.
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You didn't say what the actual oil usage was after you replaced the PCV valves.
Not knocking what is working for you but have you tried 15/40? We used to run the straight 30 in our 5.7 Kodiak with a 3 stage Hamilton in our 20' Ali-craft. It seemed to be a common choice with jet boaters. The result was similar to yours. Switching to 15/40 greatly reduced it's consumption and extended the service interval.I thought 1 QT in jet boat with a 350 at 3,500 RPM as a lot after 30 hours of use. Look at it this way you spent $10 on oil and $600 on gas. I use strait 30 weight oil. Oil type and manufacture can make a difference in oil consumption. What does your manual say to use.
1qt of oil in 2.5hrs is a lot, if it's not burning it it has to be going out through the oil cooler -- just no way that much oil disappears without leaving a trail - smoke, a sheen, smell, something.
This is very interesting to me. My 91 has a aft seat that folds against the transom. When we were shopping i looked at some 95-98 that had wrap around transom seats that were bolted in place over the engine hatches. We shyed away from them cause wife and me couldn’t figure out how to open the hatches.No oil cooler on her...not on this year of 5.7 Bluewaters.
I have been running Quicksilver the 25/40 since I got her....I think once or twice I found some 20/50 and tried that.
I've also started using a bit of that Rislone treatment. Will use more.
Normally I don't mind just topping off oil after every longer run, BUT....these older Dancers...gotta pull the 2x big curved aft bench seats and then the 4x big deck plates. I'm in mid 50's with a pretty bad lower back (lots of smashed disks). So I can't do much longer.