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Changed oil, lost 3-4 mph on top end!@$?

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Changed oil, lost 3-4 mph on top end!@$?

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Old 04-18-2005, 06:53 PM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
What about the fuel?
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Old 04-18-2005, 08:13 PM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Also check out if the boat was stored incorrectly over the winter. There are other threads on here about guys who have mysteriously lost 5 or more mph due to a hook developing from hanging the transom off the bunks. Just a thought...
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Old 04-18-2005, 09:47 PM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Sounds strange. take some oil with you to the lake and retest, then change your oil back to the merc. Then retest right away. Only way to see if this is true.
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Old 04-19-2005, 08:48 AM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Originally Posted by Steve_H
Barry , when was the last time you ran the boat before the oil change? its amazing how much faster boats run when its cold out.
Steve, I think you're on to something. The last time I ran the boat was 3 weeks ago and it was 45 air temp. It was 85, as you know, this last weekend.

BTW, thanks again for the help with the dock!
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Old 04-19-2005, 09:06 AM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Mobil 1 15W50
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Old 04-19-2005, 09:20 AM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Originally Posted by CObarry
Steve, I think you're on to something. The last time I ran the boat was 3 weeks ago and it was 45 air temp. It was 85, as you know, this last weekend.

BTW, thanks again for the help with the dock!
That's your answer right there!! Cool air will give you the extra rpm's.
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Old 04-19-2005, 09:30 AM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
I have used the same valvoline straight 40-racing oil for the last 3 seasons in my 502's...never had a problem.
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Old 04-19-2005, 09:43 AM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
Originally Posted by CObarry
Steve, I think you're on to something. The last time I ran the boat was 3 weeks ago and it was 45 air temp. It was 85, as you know, this last weekend.

BTW, thanks again for the help with the dock!
no big deal. you and Chris did all the work anyway.
besides , hanging out with you saved me hundreds of dollars in gas money.
 
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Old 04-19-2005, 07:31 PM
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Default Re: Changed oil, lost 3-4 mph on top end!@$?
I have seen this problem with a 4cyl nissan truck, the owner changed from 20w50 to 10w30 ,it made big differance.
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