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Old    CONSIGLIEREG8R (consigliereg8r)      Join Date: Aug 2009       02-06-2010, 2:11 PM Reply   
I was surprised to hear that the dealership told be to use Rotella T diesel 15w-40. When I was in college I worked @ a truck stop and that is what we sold to trucks
Old    Ajholt7 (ajholt7)      Join Date: Apr 2009       02-06-2010, 2:16 PM Reply   
Amsoil marine 10w-40
Old    Mattt (motorcitymatt)      Join Date: Feb 2007       02-06-2010, 2:21 PM Reply   
Royal Purple 10w-40
Old    Tim C (lifetimewarranty)      Join Date: Oct 2008       02-06-2010, 2:29 PM Reply   
Mobil 1 5w-30 (same as my tahoe, as they are pretty much the same motor)
Old                02-06-2010, 2:30 PM Reply   
15W-40 Rotella in my SAN. The PCM manual recommends 15W-40 and Rotella (Shell) seems like a good brand. The manual also recommends against synthetic. Marine oil is hard to find and more expensive. I'm sure you are good with any 15W-40 as long as you are changing it within the manufactures recommendations.
Old    CONSIGLIEREG8R (consigliereg8r)      Join Date: Aug 2009       02-06-2010, 2:31 PM Reply   
damn does it take forever to drain
Old    Ajholt7 (ajholt7)      Join Date: Apr 2009       02-06-2010, 2:36 PM Reply   
Mine doesn't take too long as long as you let the boat warm up before you drain it.
Old    Art (rallyart)      Join Date: Nov 2006       02-06-2010, 2:37 PM Reply   
Mobil 1 15W-40
Old    Ajholt7 (ajholt7)      Join Date: Apr 2009       02-06-2010, 2:45 PM Reply   
It doesn't matter what type of forum you go to(truck, car, boat) any time you ask a question about what oil to use there will be 100 different answers. Manufacturers recommend what they have tested with. It doesn't necessarily mean it is the best. The only thing I know for sure is that regular oil changes are the key.
Old    CMC X Stars (02wakesettervlx)      Join Date: Jun 2001       02-06-2010, 3:53 PM Reply   
Mobil 1. Cars, truck, boat, I have always had good luck with it.
Old    Derek (camassanger)      Join Date: Oct 2009       02-06-2010, 4:00 PM Reply   
Amsoil in everything with a piston. Marine 10W-40 in the Sanger.
Old    Hayes (hayes)      Join Date: Aug 2007       02-06-2010, 4:11 PM Reply   
Mobil 1 15w-50
Old    Mitch (wakemitch)      Join Date: Jun 2005       02-06-2010, 4:31 PM Reply   
The new industry standard is 25w-40. Ask any inboard service center
Old    Sparky Jay (wake_upppp)      Join Date: Nov 2003       02-06-2010, 4:50 PM Reply   
Valvoline 10/40 conventional every 25hrs.
Old                02-06-2010, 5:56 PM Reply   
Penzoil SAE 30.

Works fine for me!!
Old    Harold Hemming (h20king)      Join Date: Dec 2009       02-06-2010, 8:27 PM Reply   
valvoline raceing 40w
Old    Bryan Locke (gwnkids)      Join Date: Nov 2003       02-06-2010, 11:31 PM Reply   
^^ I with Harold on the VR1 40w because I have a 383 stroker in the BU and it has the Zinc
Old    FJK (ship_of_fools)      Join Date: Sep 2007       02-06-2010, 11:51 PM Reply   
I have a friend who is a engine builder and also boats. Last year he recommended the Rotella T to me as well.

The Rotella T diesel oil was recommended because they were able to get by some legislation about having zinc in the oil (something about it being for diesels it was not included).

However, that has recently changed and it is no longer being made with the higher levels of zinc...

You may be able to get it by using an additive.

I have an I/O and will be switching to Mercruiser oil and changing it more often.
Old    lok'tar mcgee (gerald_withanuuh)      Join Date: Oct 2009       02-07-2010, 1:08 AM Reply   
its mobil 1 15w-50
Old    j. gatsby (johnny_gatsby)      Join Date: Sep 2009       02-07-2010, 1:11 AM Reply   
I'm pretty sure lok'tar has no idea...
Old    Hayden Pesko (hfpesko)      Join Date: Dec 2006       02-07-2010, 9:17 AM Reply   
talked with the lead machanic here in houston (for malibu) and he said to run mobile 1 20w-50 due to the environment that we have. thats what he puts in all the boats that he works on and so do I
Old    Sparky Jay (wake_upppp)      Join Date: Nov 2003       02-07-2010, 10:50 AM Reply   
20/50 is usually used in older engines with higher miles/hours, or race engines with bigger tolerances. 50 is pretty thick especially in hotter climates for a late model healthy engine.
Old    JS (dreamer)      Join Date: Nov 2008       02-07-2010, 11:16 AM Reply   
My boat has the Black Scorpion 330hp and the manual recommends running a Quicksilver synthetic blend.
Old    Sparky Jay (wake_upppp)      Join Date: Nov 2003       02-07-2010, 11:35 AM Reply   
^^^Same here. I ran that until it was out of warranty then switched. I dont leave oil in long enough in any of my vehicles to justify the price of synthetics.
Old    Sinko (sinkoumn)      Join Date: Jan 2007       02-07-2010, 11:46 AM Reply   
Valvoline VR1 SAE40
Old    nate (ncc74)      Join Date: Oct 2006       02-07-2010, 11:58 AM Reply   
Upload
Old    Chris (rio_sanger)      Join Date: Apr 2007       02-07-2010, 6:18 PM Reply   
Delo 40w
Old    Meathead (meathead65)      Join Date: Sep 2006       02-07-2010, 10:33 PM Reply   
It is interesting that Mercruiser, the world's largest inboard manufacturer, recommends a 25-40 spec oil, which happens to be pretty tough to find in any brand other than their own.

We worked for a long time with our oil jobber here in Sac, and have settled on Valvoline Synthetic 20-50 for most of our inboard and sterndrive applications. We always ask the customer and tell them they have a choice of using the Valvoline, or we will use whichever oil their particular manufacturer specifies if they so choose. The Valvoline Synthetic is extremely good oil, and it costs quite a bit.

As long as you are changing the oil anywhere close to the recommended drain intervals, you will be fine with pretty much any quality lubricant, conventional or synthetic. The simple fact is that the typical ski/wake boat engine is not going to stress the lube hard enough to cause any issues. Guys running ultra high HP units, with huge bearing stress loads (like turbo or blower applications), need to be a bit more choosy with what they feed the crankcase.
Old    kaligirl            02-08-2010, 9:12 AM Reply   
Is it bad if you put in 15W/40 when there was already 10w/30 in it? I had 15-40 because that's what was on the oil cap, but when I had my last service they put in 10-30. I was on the water, the boat needed more oil and 15/40 was all I had on board. Should I drain it all and start over?
Old    Meathead (meathead65)      Join Date: Sep 2006       02-08-2010, 12:47 PM Reply   
I wouldn't worry about it. You have created a minor blend of 2 oils that are both perfectly fine in your motor.
Old    Mattt (motorcitymatt)      Join Date: Feb 2007       02-09-2010, 4:55 PM Reply   
Kathleen~

Don't sweat it, as long as ya changed the swim platform gasket..... J/K :-)

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