Marine Lubrication
#1752
Registered
High TBN numbers have nothing to do with storage.
It is a number on a scale that is used to deal with acid neutralization from combustion in diesel engines.
The acid was formed due to the sulfer in the fuel, but due to low sulfer diesel fuel now, this number is not as important as it was 15 years ago.
If your hanging your hat on a TBN number, times have changed.
Ken
It is a number on a scale that is used to deal with acid neutralization from combustion in diesel engines.
The acid was formed due to the sulfer in the fuel, but due to low sulfer diesel fuel now, this number is not as important as it was 15 years ago.
If your hanging your hat on a TBN number, times have changed.
Ken
#1753
Registered
True, TBN has little effect in storage.
But TBN is applicable to gasoline engines, as both sulfuric, nitric and organic acids are formed from combustion gases and water - in any internal combustion engine. It is true that the previous higher sulfer content created more acid, but the issue has not gone away. That is why "extended change" oils have higher TBN to start.
But TBN is applicable to gasoline engines, as both sulfuric, nitric and organic acids are formed from combustion gases and water - in any internal combustion engine. It is true that the previous higher sulfer content created more acid, but the issue has not gone away. That is why "extended change" oils have higher TBN to start.
#1754
Registered
I agre the issue has not gone away, but with low sulfer fuels, both gas and diesel, it is much less of an issue.
Besides, when you store you engine, you should have fresh oil in it and there should be almost no contamination in it.
Yes "extended change" oils have a higher TBN, but does anybody really change the oils at the extended interval?
I would guess the majority of the people on ths board would say no.
Ken
Besides, when you store you engine, you should have fresh oil in it and there should be almost no contamination in it.
Yes "extended change" oils have a higher TBN, but does anybody really change the oils at the extended interval?
I would guess the majority of the people on ths board would say no.
Ken
Last edited by minxguy; 10-14-2011 at 05:53 AM.
#1755
Disagree
High TBN numbers have nothing to do with storage.
It is a number on a scale that is used to deal with acid neutralization from combustion in diesel engines.
The acid was formed due to the sulfer in the fuel, but due to low sulfer diesel fuel now, this number is not as important as it was 15 years ago.
If your hanging your hat on a TBN number, times have changed.
Ken
It is a number on a scale that is used to deal with acid neutralization from combustion in diesel engines.
The acid was formed due to the sulfer in the fuel, but due to low sulfer diesel fuel now, this number is not as important as it was 15 years ago.
If your hanging your hat on a TBN number, times have changed.
Ken
Acid neutralization also takes place in gasoline engines.
Amsoil 15W40 Marine Diesel has a high TBN number of 12 which is even higher than most synthetic oils which are usually around 9. This high TBN gives this oil a higher drain interval. This gives the oil a longer acid fight control within the motor.
I don't were hats.
Last edited by Mariah212Z; 10-13-2011 at 08:20 PM.
#1760
Resurrecting the Dragon - the world's longest oil thread
What an incredible thread! All these years boating (about 30) I've used manufacturer recommendations only and I see a lot of other possibilities now!
Not that manuf recs are necessarily bad. Lets start with Mercury. How many Mercury oils are there?
At least three...
1 Original 25W-40
2 Blended semi synthethic 25W-40
3 Full synthetic 20W-40
Which one would be the best for 500/525EFI engines? I heard the most recent full synthetic Mercury oil has less antiwear additives (Zn, P) because of catalytic converter issues. Well, most of us don't have cats and want the best oil.
What about AMSoil Dominator 15W-50, Bob Teague's current racing choice? He runs 525's. They change oil after every race. Can you use this for 20-25 hours for average to hard recreational use?
Thanks, Andy
Not that manuf recs are necessarily bad. Lets start with Mercury. How many Mercury oils are there?
At least three...
1 Original 25W-40
2 Blended semi synthethic 25W-40
3 Full synthetic 20W-40
Which one would be the best for 500/525EFI engines? I heard the most recent full synthetic Mercury oil has less antiwear additives (Zn, P) because of catalytic converter issues. Well, most of us don't have cats and want the best oil.
What about AMSoil Dominator 15W-50, Bob Teague's current racing choice? He runs 525's. They change oil after every race. Can you use this for 20-25 hours for average to hard recreational use?
Thanks, Andy