Best Engine Oil for 1981 8 cylinder Crusader 305

[rperla]

What type of engine oil would you suggest for thes engines. Boat draws raw salt water for cooling. I put about 15 hours on the engines monthly. Use boat in Southern Cal.

 

[Haut Medoc]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

There are a zillion posts on this subject. Rummage around in the 'search' and you will find your answer...........J

 

[rperla]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Thank You

 

[Scaaty]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Come on JK, oil questions are FUN! Let her'rip. Anyway, straight 40w, dino or Syn, but you will get different opinions. I run Diesel (Rotella) 15-40 because I do much more idle to 2200 than 3500-4000 on plane in my 350, and the anti-wear properties are better in diesel (its a EPA thing). To tell the truth, "3in1" would probably work too, because the salt does the damage over time, so keep it and the manifolds flushed best as possible

 

[bluewater19]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Extra virgin olive!!!<br /> Straight 30 weight<br />15W40 DELO/Rotella<br />Any of these will work good for you.

 

[rperla]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

THANKS, THAT HELPS.

 

[crazy charlie]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Your manual will call for sae30 .I always go sae-40 instead ,incase of a situation of an overheat or some extra hot days or extended trips.A little extra protection cant hurt.Charlie

 

[LubeDude]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Originally posted by crazy charlie:<br /> Your manual will call for sae30 .I always go sae-40 instead ,incase of a situation of an overheat or some extra hot days or extended trips.A little extra protection cant hurt.Charlie

I believe you are living in a dream world if you think that the 40 Wieght will protect better if you have an overheating problem. If you want extra protection from a possible overheating problem, use Synthetic.

 

[crazy charlie]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

LD, I dont care to get into an oil dispute but if the question posed is, which will give you better protection in the case of a possible overheat?? You dont have to be an expert to know that the 40 will protect better than the 30.Thats not in a dream world ,it is logical reality.

 

[Ralph 123]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Q: What kind of oil should I use in my Crusader engine(s)?<br />A: When the average temperature is above 50 degrees F., use a good quality SAE 15W-40 "SJ". Below 50, use SAE 5W-30 "SJ"<br />

http://www.crusaderengines.com/faqs.html <br /><br />The internet (and your manufacturer's web site) is a wonderful thing

 

[Ralph 123]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Mercruiser is a different story:<br /><br />

This crankcase oil recommendation supersedes all previously printed crankcase oil recommendations for MerCruiser gasoline engines. The reason for this change is to include the newer engine oils that are now available in the recommendation. <br /><br />Older owner manuals, service manuals and other publications that are not regularly updated will not be revised to show this latest engine oil recommendation. Current owners manuals, service manuals and other service publications that receive regular updates will receive this revised recommendation the next time they are updated.<br />

http://www.mercruiser.com/fueloil_recommendation_faqs <br /><br />

 

[rperla]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

GREAT ADVISE EVERYONE. THANKS

 

[LubeDude]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Originally posted by crazy charlie:<br />You dont have to be an expert to know that the 40 will protect better than the 30.Thats not in a dream world ,it is logical reality.

Minimal at best, pretty much a myth!

 

[QC]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

LubeDude,<br /><br />Need some help over in Non-Boating Technical. Look for Xado . . .

 

[rodbolt]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Ralph<br /> did ya notice in the bold print that synthetic oils are specifically NOT reccomended? its quite funny cause Volvo SPECIFICALLY reccomends synthetic oil in there GM engines. so I just put in what the manufacture/marinizer reccomends and let it ride. I just did a pair of volvo 8.2's 18 qts of oil at 3.75 a qt.

 

[Ralph 123]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Yup and also Crusader are fine with any quality 15W -40 with the same engines... go figure.

 

[Haut Medoc]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Egad! I tried to put the 'kibbosh' on this....but 'let 'er rip' as charlie says... I run 25w-40: and I won't go back to my corner. I WON'T, I WON'T, I WON'T.... ....J

 

[rperla]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Hi All<br />Thanks for the input. Is the general consensus 25w-40w superior to 15w-40w? Why or why not?

 

[LubeDude]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

Fact is that we just like to hash oil threads to death, guess its like potato chips, ya cant eat just one.<br /><br />Anyway, Mercury claims that they combined a 25W with a 40W and came up with a 25W-40 wieght oil. Well, it just doesnt work that way, if you do that you come up with a 32.5W which when tested will pass a 25W-40 designation. A standard straight 40W will nearly pass this same test. Fact is that there is nothing really special about this oil and certainly not worth the money IMHO. I have nothing against people using a straight 30W or 40W, but I still hold firm to my opinion that a good 15W-40 oil will do a great job in an I/O engine.

 

[rperla]

Re: Best Engine Oil for 1981 8 cylinder Crusader 305

lubeDude, Your response makes sense. Thanks