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I have an 01 SAN with the GT 40, after the engine gets hot my oil pressure drops from 50 psi to 30. is this normal, i use a straight 40W, should i be using something else?
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With 2290 hours on my 1997 Ski Nautique, (GT-40) I recommend Valvoline VR-1 Racing oil. 40 weight. Use Motorcraft FL1-A oil filters. Do not use orange oil filters.
Are the numbers you gave us at an idle, or with the engine running at speed?
Are you sure your oil pressure gauge is accurate? -
Dan
Im at about the same hours (1996 SN 196 351w Ford). Are you suggesting 15/40w VR1. Im over in the UK so we never see huge water temps.Never more the 20 degrees C (68f).
Im just about to change the oil so advice be well recieved.
FLYComment
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No such thing.Originally posted by Fly100 View Post
There is straight 30w, 40w and 50w VR1. There is also 10w30 and 20w50. I run the 20w50 in all of my boats.1990 Ski Nautique
NWCTComment
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Is 20/50 not a bit heavy / thick for these motors ??Comment
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Royal Purple
Royal purple makes 15w-40 and 20w-50 for marine usage, I run the 15w-40 in my stuff after breakin. With the amount of hours on your gt-40 and provided it has had it's oil changed at prescribed intervals The Royal purple 20w-50 would be a excelent choice for your next oil change. http://www.royalpurple.com/index.php
Check it out!Comment
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Daniel,Originally posted by DanielC View Post
Thanks for weighing in with your expertise. I am in the process of buying winterization materials and will probably take your recommendation as well. I checked the Valvoline website and they only list the VR1 full synthetic in 10W30 and 20W50. They have the standard in SAE40. I assume this means that you are recommending the natural versus synthetic?
Thanks!Comment
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The GT40 motor requires motor oil with zddp additives that many modern oils don't have, the vavoline oil referenced above has it, as does the castrol diesel 15w-40 I run given I live in the north and ski in cold temps in the spring and fall. I quickly looked at RP's website and they don't provide tech specs on what the oil contains, so I would make sure it has 1200+ ppm of zinc before running it.Originally posted by teamseal View Post2018 Ski Nautique 200 TE, H6
- 2006 Ski Nautique 196 LE, Excalibur 330
- 2001 Super Sport Nautique, GT40Comment
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I run the Shell Rotella 15-40 in my '95 GT-40. It has the zinc and is readily available.\'95 SN Signature Ed.
GT-40
PP Stargaze
**For Sale**Comment
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Originally posted by jmo View Post
You might want to take a longer look.
from the Royal Purple web site: Do your motor oils contain zinc and phosphorous?
Yes. All Royal Purple engine oils contain the zinc/phosphorous compound zinc dialkyl dithiophosphate (ZDDP) and are suitable for both roller and flat tappet valve trains.Comment
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I am recommending the single weight Valvoline VR-1 motor oil. It has a part number of 229 here in the United States. PCM does not recommend synthetics, and neither do I. Royal purple may be a good oil, but I am a little suspicious of unnecessary ingredients being added to oil for marketing purposes. Royal purple also spends a lot on money on promotion, I would rather they spent it on the actual oil.
I got my manual out for my 1997 Ski Nautique. Here is the temperature, and oil recommendations:
Prevailing temperature above 50 degrees Fahrenheit, use 40 weight
Prevailing temperature between 32 degrees and 50 degrees Fahrenheit, use 30 weight.
Prevailing temperature below 32 degrees Fahrenheit. use 20W-50.
All three oil weights are available in a conventional, or natural motor oil, from Valvoline, VR-1, I think. You should take the time to warm the motor up before making it work hard.
Use the Motorcraft FL1-A oil filter. Do not use an orange oil filter. Ever
In the transmission, Dexron 2 was specified. That was superseded by Dexron 3, and then a Dexron/Mercon formula. That is the transmission fluid I currently use.Last edited by DanielC; 10-06-2010, 10:48 AM.Comment
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Yep - I missed that on the FAQ section - I'm on an iPhone so cut me some slack ;@) I was looking for a spec sheet that details out how much zddp they add, I would still want to verify the ppm added to make sure it exceeds 1200 ppm, but as Dan points out PCM doesn't recommend synthetics anyways.Originally posted by teamseal View Post
Don't get me wrong, I like RP products, I run their gear oil in my trucks front and central transfer cases.
JMO2018 Ski Nautique 200 TE, H6
- 2006 Ski Nautique 196 LE, Excalibur 330
- 2001 Super Sport Nautique, GT40Comment
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Engine oil
All I could find with Royal Purple was the 5W30 for Marine motors and the owner's manual suggest the 40W... Any thoughts?Comment
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Originally posted by jmo View Post
Royal Purple does have ZDDP levels that are suited for flat tappet motors. Someone did a test and it was above 1200ppm.
Synthetics are fine in 5.8 PCM's , as long as the ZDDP levels are high enough.
Redline and Amsoil are also other full synths that has enough ZDDP in the proper weights.Last edited by horkn; 10-08-2010, 12:56 AM.Comment
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Being a PCM dealer myself and having many conversations with the waranty and devlopmental staff their big concern with synthetics is utilizing them before the motor breaks in properly. I dont feel a motor is really not broke in until 75 hours of regular usage and a service regime accordance to the manufacturers recomendation.
I utilize the Rotella on my own motors until the 75 hours and then the Royal purple 15W-40 goes in. We now have 50 on the 2011 CB 6 liter and will be again utilizing the Rotella for the next 25 hours.
The 502 in my sprint boat had Royal purple added on it's second oil change as it is a extreme duty race motor.
But to each their prefrence as long as the service intervals are maintained and quality product utilized. Also I only use Wix filters.
Cheers!Comment
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