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Old 06-15-2014, 10:32 AM
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Aflyer Aflyer is offline
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Boat: 1999 Mastercraft Maristar 205VRS
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Question High oil pressure

I recently bought a 1999 Maristar 205VRS with a 330HP 5.7 liter 350 vortec MX Max LTR engine. The previous owner had used 10W-40 oil, I changed the oil and put in 15W-40 per the manufacturer specs. Now the oil pressure is anywhere from 6 PSI at idle to almost 70 PSI at cruise speed. Normal operating range is between 6 PSI at 1000 RPM and 40PSI at cruise speed.
Any input would be appreciated.
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Old 06-15-2014, 11:05 AM
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mikeg205 mikeg205 is offline
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seems like your gauge or sender might be a bit out of whack. - 6 seems low and 70 does seem high. the 10w-40 isn't bad since your not running the boat at 32 degrees -- I get 40psi at cruise as well on my 350.
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Old 06-15-2014, 07:00 PM
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ricford ricford is offline
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I use 20W-50 in my LT-1 and it runs around 70psi when it's cold. As it warms up the pressure drops off a bit to around 50. Not sure at idle, but 6 seems really low.
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Old 06-15-2014, 07:55 PM
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Rossterman Rossterman is offline
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Probably need to put a manual guage on to verify as the in dash unit isn't real accurate sometimes. If you have 6lbs at idle I'd be concerned that there is excessive rod or main bearing clearance. My bet is that you will find that it's fine and just a sender or guage issue. If you pull the sender, make sure you don't install Teflon tape as it needs to ground theough the threads to the engine block to work correctly.
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Old 06-15-2014, 08:20 PM
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I am gonna test it with a manual gauge. After much research I think your right Rossterman, it's most likely the sender or gauge. Thanks for the help guys!
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