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Oil Change |
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tmacdonald 
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Joined: February-12-2009 Location: Canada Status: Offline Points: 8 |
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 Topic: Oil ChangePosted: May-06-2010 at 4:19pm |
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I have a 98 Ski Nautique with a a GT-40 engine and am planning on doing a oil change. I looked in the owners manual on this site and it says to use 40w/40 oil in the engine. That seems like very heavy oil. Is that what everyone typically runs in this engine?
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rmm025
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Joined: July-20-2009 Location: West Monroe, LA Status: Offline Points: 148 |
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Posted: May-06-2010 at 5:05pm |
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86 PCM 351 and I use Rotella T 15W-40
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: May-06-2010 at 6:50pm |
Trevor, You're just used to the colder climates and running thinner weight oils! 
Nothing wrong with running a staight 40 but we have lots here that run a multi weight such as Valvolene racing 20-50. The most important thing over the weight is to use a oil that's got high ZDDP content to protect your flat tappet engine. Valvolene Racing (silver bottle) and Rotella T straight weights have it. The new oils do not have the ZDDP. I run the Racing 20-50 in all my boats. |
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daddyo
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Joined: September-09-2008 Location: Austin, TX Status: Offline Points: 114 |
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Posted: May-06-2010 at 8:44pm |
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The multi-vis rotellas don't have the extra ZDDP according to some exhaustive research posted on this forum in the past. I've used the rotellaT straight 30w for the past 3 years with no problem. But, they've changed their packaging this year and are calling the straight weights "T1" or something like that. It may be the same with the higher ZDDP, it may not. Shell's website is not clear as to what's going on, so I'm planning to switch to the valvoline vr1 after this year. Mobil 1 also has a multi-vis specifically marketed with higher wear protection (ZDDP), I think it's the 15-50. I've never used that and am unaware of anyone else using it, but mobil touts it on their website.
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jimsport93
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Joined: February-20-2008 Location: Alpharetta Ga Status: Offline Points: 1749 |
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Posted: May-09-2010 at 1:35pm |
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My boat is a '93 Sport with the Pro Boss, 351 HO carbed.
Bought the boat three years ago from original owner. Owners manual says 40w. Called the original dealer for recommendation after I had a difficult time finding the 40w (I now know where to look). Dealer said to use 10w30 and add STP to it. Pete, any thoughts on that? I will probably switch to the VR1 next oil change after taking your recommendation. |
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LaurelLakeSkier
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Joined: February-12-2007 Location: Wisconsin Status: Offline Points: 485 |
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Posted: May-09-2010 at 2:39pm |
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The STP is supposed to have the ZDDP additive in it and there are other additives that put the zinc in as well. The STP is the cheapest so I wonder how much zddp it adds.....with the other additives (about $10/treatment), it seems like you are better off just spending a little extra and using the VR1 to begin with. The only issue with VR1 could be finding the viscosity you want. In the boat, I run the 20w-50 without problems but some other engines/applications may not handle the thicker stuff as well.
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malibud
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Joined: July-08-2009 Location: north carolina Status: Offline Points: 611 |
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Posted: May-10-2010 at 12:33pm |
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VR1 is half off at auto zone now $2 a quart
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kapla
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Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Posted: May-11-2010 at 4:54pm |
geez that´s a steal!! I pay $11 here for that precious liquid 
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<a href="">1992 ski nautique
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SKI NH
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Joined: March-26-2010 Location: Freedom, NH Status: Offline Points: 27 |
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Posted: May-12-2010 at 3:44am |
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I don't feel too sorry for you. I've been to Argentina and seen your women!
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SKI NH
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rmm025
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Joined: July-20-2009 Location: West Monroe, LA Status: Offline Points: 148 |
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Posted: May-12-2010 at 6:29pm |
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I have converted over to VR1 now, with the autozone promotion, I bought 2 cases so I will be VR1 for at least 3-4 years. Haven't changed yet, but debating changing again just to go with the VR1.
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tmacdonald wrote: