Boats For Sale:
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decker1 
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Joined: May-20-2006 Location: United States Status: Offline Points: 1 |
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 Topic: oil typePosted: May-20-2006 at 11:08am |
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I have a '86 Ski Nautique. When the boat is in gear at a idle the oil pressure drops. What is the recommended oil and weight. I bought the boat used and have no owners manual. Can I use a synthetic oil? Any replies would be appreciated.
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Dan Decker
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: May-20-2006 at 12:36pm |
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use what ever grade type and brand you would use in your own car, this comes up once or twice a year, so if you want to read all the debait, do a search for oil.
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Jim_In_Houston
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Joined: September-06-2004 Location: United States Status: Offline Points: 1120 |
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Posted: May-20-2006 at 1:36pm |
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Sure you can use synthetic oil. I use it all the time - that is, whenever I come across a can of it I pour it around my fence to kill the weeds. It works very well.
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Happy owner of a '66 and a '68 Mustang
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79nautique
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Posted: May-20-2006 at 2:37pm |
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Nice...... do you have to put down the speedo when your kill'n weed's????
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Jim_In_Houston
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Posted: May-20-2006 at 2:47pm |
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79, I do like your suggestion of using the same oil in your boat as in your car. That is the smartest comment I've seen in this whole oil debate. That way you don't have two kinds of oil setting around on your garage shelves. With age comes wisdom, or one would hope...
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Happy owner of a '66 and a '68 Mustang
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The Lake
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Joined: May-13-2005 Location: Lk Winnebago MO Status: Offline Points: 1157 |
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Posted: May-20-2006 at 5:13pm |
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JIY and 79, that's what I do, I use the same oil in my truck, the Mrs. Lake car, the Nautique, and now the old 78 Honda bike (got it to save money to buy gas for the boat--that's my story and I'm sticking to it).
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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Posted: May-20-2006 at 6:49pm |
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PCM's recommendation on the 351w is to use straight 40w. Some argue that multi-weight oil gives better protection for cold starting and warmup without sacrificing protection once the engine is warm. I havent seen any hard data, but the reasoning makes sense to me. 15w40 is also easier to find than straight 40w. Shell Rotella and Castrol Syntec are both good brands, as is Valvoline. I would avoid Pennzoil and Quaker State from what I have read.
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jimbo
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Posted: May-21-2006 at 1:56pm |
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The sticker on the valve cover of my '84 says to use 20W40. I've started using Rotella 15W40.
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AWhite70
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Posted: May-22-2006 at 9:20am |
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When you put the boat in gear at idle the engine speed drops, which causes the oil pump to turn slower. At idle you don't have a lot of excess oil flow so it's normal for the oil pressure to drop. What is it dropping to? As long as you have over 10psi you should be ok.
I'm going on memory but I think I've got about 40psi at idle and the needle moves significantly if engine speed drops much when the boat is put in gear. |
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jimbo
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Posted: May-22-2006 at 10:50am |
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I read somewhere 10 psi per 1000 rpms is ok. Fords have poor oil pressure.
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Waterdog
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Posted: May-22-2006 at 11:38am |
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Straight grade oil has much better lubrication qualities than multi-grade blends.
That being said,use what you will,don't let it get low,change it often and use a quart of Lucus oil additive at every oil change. Your engine will thank you. |
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Nautique2001
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Posted: May-22-2006 at 12:28pm |
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I have a '86, 2001. Frankly, the VDO gauges don't seem to be the best quality. We also have the idiot light for the oil pressure. My oil gauge is jumpy, but does increase and decrease depending on RPM's. I check my oil level now and then.
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Tim D
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Posted: May-22-2006 at 2:49pm |
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I use 5w30 and my Ford has 80 pounds at idle, thanks to a melling pump.
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Tim D
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jimbo
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Posted: May-23-2006 at 12:05am |
Now we're talkin' Note to self: melling pump at rebuild or timing chain replacement. I'm laughing though, because with all the concern over oil types and change intervals and everything, I've never heard of anyone blowing an engine that wasn't really low on oil or had a cooling problem or was doing something stupid. The motor oil folks are doing a good marketing job. |
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Tim D wrote: