Marine Lubrication
01-02-2007, 09:36 PM
#1072
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Re: Marine Lubrication
Mercury 25W-40 is a blend of straight 25 wt and 40 wt oils ...so I am told. The overall viscosity can not therefore be compared to a multi-vis oil as it supposedly does not have polymers that react and increase viscosity with heat. So the lowest viscosity the oil can be said to perform at is 25wt. Therefore a 10 wt is too light.
The bottom line is Merc's product is more comparable to a straight weight 40.
So using a 10W-40 multi-vis oil in place of a 40 wt will probably lead to some type of problems and most notably probably increased wear.
We hear that the following oil viscosities are used routinely and successfully;
15W-50
25W-40 Mercury
20W-50
15W-40 Amsoil Synthetic ("pleasure boats")
30wt if less than 50*F
40 wt for temps between 75-85*F
50wt for temps over 85*F
For 4-stroke outboards I like a 10W-40 such as Amsoil's or 10W-40 V-twin.
The bottom line is Merc's product is more comparable to a straight weight 40.
So using a 10W-40 multi-vis oil in place of a 40 wt will probably lead to some type of problems and most notably probably increased wear.
We hear that the following oil viscosities are used routinely and successfully;
15W-50
25W-40 Mercury
20W-50
15W-40 Amsoil Synthetic ("pleasure boats")
30wt if less than 50*F
40 wt for temps between 75-85*F
50wt for temps over 85*F
For 4-stroke outboards I like a 10W-40 such as Amsoil's or 10W-40 V-twin.
Let's see if I can help out here.
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
01-03-2007, 08:11 AM
#1073
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Re: Marine Lubrication
Let's see if I can help out here.
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
01-03-2007, 08:15 AM
#1074
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Re: Marine Lubrication
The question becomes do we continue with M-1 15W-50 from a number of you?
My answer is that in an offshore boat you need the best edge you can get if you are to see the most longevity from your engine. I like a Group IV/V synthetic best.
Here are the 2007 2,000lb. synthetic oil gorrillas:
M-1 V-Twin 20W-50/Redline 20W-50/RP 20W-50/Amsoil Severe Service 20W-50/Spectro 20W-50.The list is getting shorter.
Yes...15W-50 M-1 is still a great product and i use it as well. It is NOT on the list above however.
My answer is that in an offshore boat you need the best edge you can get if you are to see the most longevity from your engine. I like a Group IV/V synthetic best.
Here are the 2007 2,000lb. synthetic oil gorrillas:
M-1 V-Twin 20W-50/Redline 20W-50/RP 20W-50/Amsoil Severe Service 20W-50/Spectro 20W-50.The list is getting shorter.
Yes...15W-50 M-1 is still a great product and i use it as well. It is NOT on the list above however.
01-03-2007, 08:21 AM
#1075
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Re: Marine Lubrication
Let's see if I can help out here.
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
01-03-2007, 08:25 AM
#1076
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Re: Marine Lubrication
The question becomes do we continue with M-1 15W-50 from a number of you?
My answer is that in an offshore boat you need the best edge you can get if you are to see the most longevity from your engine. I like a Group IV/V synthetic best.
Here are the 2007 2,000lb. synthetic oil gorrillas:
M-1 V-Twin 20W-50/Redline 20W-50/RP 20W-50/Amsoil Severe Service 20W-50/Spectro 20W-50.The list is getting shorter.
Yes...15W-50 M-1 is still a great product and i use it as well. It is NOT on the list above however.
My answer is that in an offshore boat you need the best edge you can get if you are to see the most longevity from your engine. I like a Group IV/V synthetic best.
Here are the 2007 2,000lb. synthetic oil gorrillas:
M-1 V-Twin 20W-50/Redline 20W-50/RP 20W-50/Amsoil Severe Service 20W-50/Spectro 20W-50.The list is getting shorter.
Yes...15W-50 M-1 is still a great product and i use it as well. It is NOT on the list above however.
01-03-2007, 08:49 AM
#1077
Registered
Re: Marine Lubrication
Let's see if I can help out here.
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
The Merc 25w-40 is a 40 wt oil not a combination of multiple weights.
This is much like the AMSOIL ACD 10W-30/SAE 30 and the AMSOIL ASE 10W-30/SAE 30. These oils are SAE 30 motor oils that meet the cold flow criteria to be considered multigrades. Your typical 10w-30 oils require the use of Viscosity Index Improvers (VII) added to lighter grade oils to acheive the multigrade specs while these oils use high viscosity index, wax-free synthetic bases. This means these oils start a SAE30 and stay an SAE30 not start as a low viscosity base stock, add viscosity improvers, and act like a heavier oil. The problem is your typical 10w-30 is more susceptible to shearing as you lose Viscosity Improvers while the "Combo" oils stay strong.
How does this relate to the Merc 25w-40???? My feeling is this oil is a SAE40 oil but meets the 25W criteria for cold flow like the AMSOIL oils above.
Are you confused yet?
Ken
Some multi viscosity oils do not have any polymer to shear. When you blend some base stocks they produce a base stock that could have very desirible charateristics not available in either of the originals. "The whole is greater than the sum of its parts"
Ken
01-03-2007, 12:45 PM
#1078
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Re: Marine Lubrication
I got a bunch of PM's that expressed discontent with M-1 15W-50 EP allegedly changing over to GRP III.
Am I happy with this decision? Not in the least!
Is 15W-50 still a good product ...yes.
Is there something out there for around $6.00/qt that remains a true Grp IV PAO with excellent ZDDP additives etc?
Yes!!
What is it?
Royal Purple 20W-50 sold in 5 gallon pails and shipped UPS free to your door for $6.25/qt and $6.99 in single quarts. While at it their gearlube is excellent and a PAO product as well.
How do I get it?
http://www.rpmoil.com/index.php?main...b62a8a9bc42262
Is this what I would use if I decided not to use V-Twin @ $9.00/qt. Yes.
I am hence moving my 15W-50 M-1 use over to RP 20W-50 as it is a PAO/ better value and quite comparable to V-twin as well for $6.25/qt in bulk 5 gallon units with free UPS delivery in the 48's..
Am I happy with this decision? Not in the least!
Is 15W-50 still a good product ...yes.
Is there something out there for around $6.00/qt that remains a true Grp IV PAO with excellent ZDDP additives etc?
Yes!!
What is it?
Royal Purple 20W-50 sold in 5 gallon pails and shipped UPS free to your door for $6.25/qt and $6.99 in single quarts. While at it their gearlube is excellent and a PAO product as well.
How do I get it?
http://www.rpmoil.com/index.php?main...b62a8a9bc42262
Is this what I would use if I decided not to use V-Twin @ $9.00/qt. Yes.
I am hence moving my 15W-50 M-1 use over to RP 20W-50 as it is a PAO/ better value and quite comparable to V-twin as well for $6.25/qt in bulk 5 gallon units with free UPS delivery in the 48's..
Last edited by Hydrocruiser; 01-03-2007 at 04:39 PM.
01-03-2007, 08:48 PM
#1079
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Re: Marine Lubrication
If an oil label has listed a 10w30 for viscosity, that oil meets the specifications of a 10w at zero* F AND a SAE 30 at 210* F. Two different specs...........two differect viscosities... thats the way it is. If you took an SAE 30 and a 10w30 and placed them in your refridgerator, the 10w30 will pour easier than a straight 30, thats the difference between a muti vis and a straight weight. At 210*F they both meet the same test specs. A manufacture can put a multi vis 10w30 in a bottle and sell it as either a 10w30 or a SAE 30 or a 10w, all legal, a little improper, but legal.
Some multi viscosity oils do not have any polymer to shear. When you blend some base stocks they produce a base stock that could have very desirible charateristics not available in either of the originals. "The whole is greater than the sum of its parts"
Ken
Some multi viscosity oils do not have any polymer to shear. When you blend some base stocks they produce a base stock that could have very desirible charateristics not available in either of the originals. "The whole is greater than the sum of its parts"
Ken
SAE Viscosity-Cranking (cP)
Grade - Max at temp oC
0W - 6200 at –35
5W - 6600 at –30
10W - 7000 at –25
15W - 7000 at –20
20W - 9500 at –15
25W - 13,000 at –10
An oil can be classified as a multigrade SAE 20W-20 if the oil can meet both the low temperature cranking viscosity of 9500 cP at –15C and the 100C high temperature kinematic viscosity requirement between 5.6 and 9.3 cSt. The AMSOIL motor oils listed above meet both the low temperature requirements of SAE 10W and the high temperature requirements of SAE 30. Thus the products are true SAE 10W-30 and SAE 30 oils.
Ken
01-03-2007, 08:57 PM
#1080
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Re: Marine Lubrication
Is there something out there for around $6.00/qt that remains a true Grp IV PAO with excellent ZDDP additives etc?
Yes!!
What is it?
Royal Purple 20W-50 sold in 5 gallon pails and shipped UPS free to your door for $6.25/qt and $6.99 in single quarts. While at it their gearlube is excellent and a PAO product as well.
How do I get it?
Is this what I would use if I decided not to use V-Twin @ $9.00/qt. Yes.
I am hence moving my 15W-50 M-1 use over to RP 20W-50 as it is a PAO/ better value and quite comparable to V-twin as well for $6.25/qt in bulk 5 gallon units with free UPS delivery in the 48's..
Yes!!
What is it?
Royal Purple 20W-50 sold in 5 gallon pails and shipped UPS free to your door for $6.25/qt and $6.99 in single quarts. While at it their gearlube is excellent and a PAO product as well.
How do I get it?
Is this what I would use if I decided not to use V-Twin @ $9.00/qt. Yes.
I am hence moving my 15W-50 M-1 use over to RP 20W-50 as it is a PAO/ better value and quite comparable to V-twin as well for $6.25/qt in bulk 5 gallon units with free UPS delivery in the 48's..
