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Re: Marine Lubrication
Originally Posted by Hydrocruiser
Every oil be it conventional or synthetic is "volatile" when heated to extreme temperatures. The higher the flash-point of the product.. the less likely that the oil will decompose and "cook down" and form sludge reducing the oil level in the process.
An oil that is less volatile such as a PAO or Ester based synthetic takes heat better and does not cook down into sludge to nearly the same degree so the level stays normal and you don't usually need to keep adding more oil unless the engine is buring it for some reason. Does that explanation put it in perspective? :D |
Re: Marine Lubrication
Originally Posted by minxguy
It not so much as the oil "cooks down" but burns off. Light ends of the oil formula actually get consumed "burn off" because the light ends are more volatile than the heavier ends of the base stock. Synthetics are much, much more temp stable, hence lower oil consumption. Oil consumption is directly related to base stock volatility. The more volatile the basestock the higher the oil consumption. Ken
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Re: Marine Lubrication
I've greatly appreciated the help I've gotten from this thread. I just got a Blackstone analysis done and I'm interested in your opinions on the comments they provided.
The boat is an '03 Donzi 16 w/Chevy 305 MPI, currently with 165 total hours. The sample I sent was in the motor 35 hours. I used M1 20-50 V-Twin with a NAPA Gold (Wix) filter. Here's Blackstone's comments: "The universal averages column shows typical wear from this type of engine after about 256 hours on the oil. This oil was run just 35 hours, so wear could be considered a little high for such a short-run oil. But the metals are properly balanced and we don't necissarily think anything here shows a problem. Silicon could show the need for a new air filter, so we suggest checking that. A clean one might improve wear. Silicon could also be from sealers or an additive, which are harmless. The trace of fuel may be the reason for the slightly low viscosity. It's not a problem." My only observation is that they may not have taken into consideration that this was 35 hours of marine use. I run my boat mostly between 3500 and 4900 rpms, with little idling. Hell, it's a Donzi!! I can post the sample numbers if that would help. Thanks for your input. Randy |
Re: Marine Lubrication
gold-n-rod,
I also use the 20/50 V-Twin and Napa Gold filter (1060). Engine is a ZZ502/502. And at this time, I probably have about 30 hrs. on the oil (never have let it go that long, usually do oil & filter at +,- 20 hrs.) Would you please post the address or PM me the address for Blackstone? I'd like to have an analysis done. Thanks! |
Re: Marine Lubrication
Originally Posted by Kidnova
gold-n-rod,
I also use the 20/50 V-Twin and Napa Gold filter (1060). Engine is a ZZ502/502. And at this time, I probably have about 30 hrs. on the oil (never have let it go that long, usually do oil & filter at +,- 20 hrs.) Would you please post the address or PM me the address for Blackstone? I'd like to have an analysis done. Thanks! Be sure to order the extraction pump ($25). It makes it super easy to draw a sample. They instruct you to draw the sample within 30 min of hot shutdown. Randy |
Re: Marine Lubrication
Thanks!
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Re: Marine Lubrication
Originally Posted by Kidnova
Thanks!
Please post the results. |
Re: Marine Lubrication
FYI
The new Mobil-1 Extended Oil Filter is a big improvement over the other in terms of increased retention capacity...much stronger internals and case as well as great filtration. For about $11.00 it is hard to beat. The main problem with the older version was cases that burst. The new cases can take 5x the pressure. As I see it this is the oil filter for just about any offshore rig I would use until you get into engines exceeding 700HP and then the Fram Racing seems to be the one used most. Additionally, the most recent reformulation of Mobil-1 15W-50 extended now has similar additives to V-Twin according to Mobil. That's a stronger base; more anti-corrosion additives and a bit more ZDDP. I bought a bunch of M-1 15W-50 in quarts at Wally World last week for $6.25/qt. http://www.mobiloil.com/USA-English/...l_Filters.aspx |
Re: Marine Lubrication
FYI.....synthetic oil is coming down in price a bit too as well as gas! :drink:
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Re: Marine Lubrication
moble one ep is not available at wal mart here any moro. What would be a good oil to switch to. stock 525efi?
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