synthetic oil
 

Has anyone used synthetic oil in merc racing 525 efi's and if so, what was the result?

Re: synthetic oil
 

Be careful with synthetic oil in these engines. This is a much debated topic and there are strong opinions on each side of the argument....but there are many engine builders who claim that you should not use synthetic oil in an engine with a hydraulic, roller cam. The spring pressures on hydraulic cams are relatively light compared to solid cams. When using roller lifters, the synthetic oil is so good(slipery) that the roller can actually slide across the cam lobe rather that roll. The higher spring pressures with solid cams eliminate this problem. Is it true??? There are some in the know that says this is an old wives tale and others that swear they have seen it happen. I use a straight 40 weight valvoline just to be on the safe side.

Re: synthetic oil
 

I don't buy the argument about roller cams and synthetic oil. In my experiance, I have had nothing but good come from using Mobil 1 (various viscositys, but 15-50 in the hi-po stuff)in everything, 96 Jeep 230,000 mi on a roller cam engine still sounds and runs like new(with my 16 year old driving it :D ), 65 race hemi big roller cam, custom 114cid shovelhead roller cam, all 4 motors that have been in the boat roller cams, never a cam issue, all my work trucks,wifes car etc....
The guy who does my machine work has told me on his dyno they've seen 5 hp and cooler oil temps with synthetic
I would not use anything else but synthetic.
BTW- those motors sounded pretty good yesterday, you were at Claudios right?

Do a search for a thread by Hydrocruiser on synthetic oils, it will keep you busy for a while

Re: synthetic oil
 

I am sure Mercury Racing has done a lot of syntheitic oil tsting in their motors in a lot of high abuse/use testing.
Ask Mercury Racing and Follow their recommendations on the oil to use. Just my thoughts.

Ray @ Raylar

Re: synthetic oil
 

thanks for the response.. it stands to reason Merc Racing would only recommend their own oil products. I've been told by independant performance guru's that synth is the only way to go. I guess I have to give it a try and see what happens..

Re: synthetic oil
 

hey Sonic30ss, Yup I was across the pond at Claudios.. Were you directly across from me?

Re: synthetic oil
 

I see your on here too!!!!!!!
The Gladiator has it in it now and mobil 1 is going back in. Phil at lip ship seems to only use mobli 1 so were sticking with it. Ive heard nothing but good. Go for it.

Danny

Re: synthetic oil
 

My 525's are under warranty. I was told by Mercury to use their oil & filter or no warranty ! So thats what I use.

Re: synthetic oil
 

That was me

Re: synthetic oil
 

my 525's now have over 300 hours! So I figure what the hell, If synth oil makes em blow it's time for more cubic inches anyway! Anyone know the Amsoil equivilent of Kendall racing straight 40 weight?

Re: synthetic oil
 

I prefer to use the merc 25-40

Re: synthetic oil
 

I use mobile one 15-50 in my 525efi.

Re: synthetic oil
 

FYI this is an excert from a web site some good info here

http://www.carbibles.com/engineoil_bible.html



Marine Oils.
I sometimes get asked "why are marine engine oils so expensive and why can't I just use regular motor oil in my marine engine instead?". Well, the National Marine Manufacturers Association Oil Certification Committee (click here for more info) introduced a four-stroke engine oil test and standard called the 4T certification. This specification is meant to assist boaters and manufacturers in identifying four-stroke cycle engine oils that have been specially formulated to withstand the rigors of marine engine operation. The certification was prompted by the growing influence of four-stroke engines in the marine market and their unique lubrication demands. So the simple answer is that regular road-based engine oil products don't contain rust inhibitors and won't pass the 4T certification. Lakes, waterways and the sea is a lot more aggressive an environment for an engine to operate around than on land.
Note : the NMMA have long had a similar specification for 2-stroke oils destined for marine use, called the TC-W3® certification.