jeffk
New Member
Need to change the oils and such. Just used Mobil 1 in my 5.7GXI VP. Getting ready to do the same on my "New to Me" 2006 300 Mercruiser 5.0L. And opposing thoughts?
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Plenty of discussions on this very subject in the past. I will say this. DO NOT use automotive oil in your marine engine, and use what the manual prescribes.
In my engines, I run full synthetic Mercury 25-40 oil, per the maint. manual. This is the oil you should run in yours.
Plenty of discussions on this very subject in the past. I will say this. DO NOT use automotive oil in your marine engine, and use what the manual prescribes.
In my engines, I run full synthetic Mercury 25-40 oil, per the maint. manual. This is the oil you should run in yours.
You can get Corn Oil from Sam's for $5.00/gallon....
You all are getting ripped off...
Now where's that can of pledge for my strataglass and the velcro for my new rudder indicator?
I'm using synthetics in everything I own as well. Good oil is good oil - however synthetics have shown to have better performance at temperature extremes and with overall wear. Which oil and what brand will quickly become a spiraling thread - I'd recommend the Mercruiser oil if you are still under warranty.
Jim, the synthetic that is referenced above is a new oil, out in 2009. For some reason, in mercury's wisdom, they made the label the same color as the outboard oil...only they know why, but it is not the same stuff as the outboard oil you reference above.
In 2006 I picked up 5 gallons of oil from my dealer. They all came in a burgandy bottle, 3 were synthetic blend with blue in the label and 2 were synthetic with green in the label and stated for outboards. I called mercury and after getting to the right person was told to only use the 25-40 synthetic blend in my inboard engines. The reason for this was due to moisture. That moisture will will stay on top of pure synthetic oil and will blend with the other not causing any harm to the engines. That pure synthetic was ok for outboards because they run hotter.
If you use the 25-40 synthetic blend you also need to use high efficiency oil filters.
jimbo, here are the oil recommendations as per the Mercruiser site, take your pick. http://northamerica.mercurymarine.com/serviceandwarranty/mercruiserfaqs/fueloil.phpWhen I purchased my oil last year I knew nothing about this new oil. I'll have to look into this. If you find the info, please post it. Thanks for the tip.