Marine Lubrication
09-11-2012, 06:02 PM
#1761
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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
10-02-2012, 02:48 PM
#1762
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Is there an update/change in oils on the top five (in order) oils? I am looking for a good oil for a blower motor. I was told to just stick with merc oil. Also, what would be a better practice...buying a cheaper (above recommended) oil and changing after about 15-20 hours or using a better/best oil and changing once a season? FYI, my season is about 25 hours. Thanks!
Last edited by DRP; 10-03-2012 at 02:09 PM.
10-14-2012, 02:25 PM
#1764
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The AMSOIL Dominator 15w-50 is great for a blower application due to the additive package that is in the oil.
http://www.amsoil.com/storefront/rd50.aspx
I would stick with a 50weight oil of some sort, specifically a synthetic, because they can battle the potential fuel dilution you may incur due to the blower.
http://www.amsoil.com/storefront/rd50.aspx
I would stick with a 50weight oil of some sort, specifically a synthetic, because they can battle the potential fuel dilution you may incur due to the blower.
10-14-2012, 03:03 PM
#1765
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Is there an update/change in oils on the top five (in order) oils? I am looking for a good oil for a blower motor. I was told to just stick with merc oil. Also, what would be a better practice...buying a cheaper (above recommended) oil and changing after about 15-20 hours or using a better/best oil and changing once a season? FYI, my season is about 25 hours. Thanks!
10-14-2012, 07:26 PM
#1766
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Seems as tho dilution is the big problem with blowers so frequent changes is the key. 15-20 hour intervals from what i have read. You could probably stretch a bit to your 25hr seasons and just change once per season. Keep track tho and dont go too far over.
05-20-2016, 06:20 AM
#1768
So, thought I should dig this old thread up. Ordered WIX racing filters, now I need to decide on an oil. My new motors are 548 CI blown motors so fuel delusion will be a factor. I know there are a lot of good oils out there, what is currently the best bang for the buck?
