|Topic Review (Newest First)|
|09-17-2009 07:09 PM|
|09-17-2009 06:42 PM|
Originally Posted by deniseO30 View Post
I am very surprised that i have not gotten a nasty gram for that one yet..
|09-17-2009 04:40 PM|
|09-17-2009 01:47 PM|
Originally Posted by deniseO30 View Post
|09-17-2009 01:24 PM|
|deniseO30||eh, me thinks winter is coming and us armchair sailors need lots of reading. Oil is oil but I know you guys really enjoy seeing it all slathered on the girls in the sun on the beach! Now I don't think the guys would mind talking about that kind of "oil" or would they???|
|09-17-2009 01:04 PM|
JRD - thanks for bringing the discusssion back down a notch. I have the 28 year old Volvo whose instructions specify 20wt. No one, including Volvo sells 20wt. I have read and truly appreciate all the responses - adds to my knowledge - but I figure I'm doing harm by not deciding on something. I doubt I'll ever start the engine from below 32F but I do sail into the late fall and early spring. Since I have never changed the oil and don't know what is in it now, I want to decide on one and stay with it (I like to minimize mixing brands and types). I got some Delo 400LE 15W40 but will probably take it back and get some Rotella T 15w40. All the mechanics I had talked to said they would use straight 30wt. but from the sounds of things here, the 15 in the 15w40 should give me better protection when starting and warming up. That is my current plan - thank again to all.
Islander 30, 1981
|09-15-2009 11:39 PM|
|jrd22||I just had to click on this when it got to 40 responses. It's oil, and you change it every 100 hours hopefully. Rotella 15-40 is approved by everyone, Delo (diesel engine lubricating oil) is also great oil. End of story. They will work in your engine.|
|09-15-2009 11:16 PM|
This is a great discussion. I use synthetics exclusively in all my vehicles and boat. The only two 'readily' or 'regularly' locally available synthetics are the Rotella 5W-40 and the Mobil 1 5W-40 (Mobil is also the Delvac Synthethic, as I understand).
RichH or Hello, given these two choices, which is the preferred oil lube and why? Or, should the sailors who choose to use synthetics in marine applications try to source a different type online, etc. For this discussion, we can assume the manuf recommendation is SAE30, which I think is typical of most sailboat marine engines. It is in my Yanmar.
|09-15-2009 08:20 PM|
My question remains, and politics and engineering (I happen to be a Mechanical Engineer by degree, but oils are NOT my specialty) aside, reality comes into play. I understand the first number can run as low as possible, but where does one buy a 30 weight diesel oil? Rotella, arguably the best (or certainly a solid player in the game -- I don't want to start THAT argument!) only sells one multi-weight, and that is 15-40. In synthetic, I can get 5-40, but it's still 40. They sell single weight 30, but in a sailboat where a significant number of engine cycles are under 10 minutes (yet another problem, but is it better to shut it down cold, idle it until warm, or drive in circles to warm it up under load so you can shut it down?), the first number is fairly important. Ah, life is full of compromises. And as an engineer, I want "the single, only, provable right answer!"
|09-15-2009 06:11 PM|
|RichH||I gave the best answer I could based on many years of actual technical/scientific/engineering experience: Use oil that has the 'suffix' number as specified and the closest (& next lower) prefix number .... whats the point of discussion of you fail to have any appreciation/comprehension/acknowledgement of that. The oil viscosity is dependent on temperature and if the operating temperature of the engine is at spec. for the 'suffix' number of the SAE oil rating then the engine will perform AT spec. This is not politics where the strongest and most developed 'presentation' and loudest voice 'wins'; this is just plain, simple FACT that is and has been accepted for the past 140 years. Unless you can intellectually present some supported and well document hydrodynamic 'anomaly', etc. to the contrary ... I simply dont intend to continue any further discourse on the matter. ;-)|
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