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Old 29-03-2012, 07:08 PM   #1
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350 mag oil pressure?

hi all, can anyone tell me what my 5.7 350 mags oil pressure should be, was running bit low end of last season so i changed oil,filter,both pressure senders and stil only getting 40psi on wot and when had a good run goes down to 10psi on tickover,picks up to 25/30 with bit of throttle.
any advice will be much apprieciated
thanks
chris
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Old 29-03-2012, 07:33 PM   #2
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might be a bit low, after a good run they normally run about 15-20ish psi. Have you rigged it up to a test gauge? If you have no alarms going off then I wouldnt worry too much about it.

Oli
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Old 29-03-2012, 09:27 PM   #3
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The electric gauges are often inaccurate. 10psi is the low limit but I would suggest you check the oil pressure with a capillary gauge screwed directly into the block.

What grade oil did you use during the last change (I use a good quality Shell 15W40) If it was a synthetic 5w30 then I suggest an oil change to 15W40 new filter and a capillary gauge before getting too worried.

Good luck and all the best

Kip
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Old 30-03-2012, 07:46 AM   #4
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Country: isle of wight
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hi all, i put quicksilver oil in cant remember grade tho, shall try a mechanical gauge and see what its reading, thanks for replys guys.chris
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Old 30-03-2012, 04:43 PM   #5
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Country: isle of wight
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Boat make: Cougar 21
Engines: Merc 2.5 promax 150
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Hi all,jus checked oil grade its 25/40 quicksilver inboard sterndrive. Jus borrowed a test gauge so will test tomorro when tides in.
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Old 02-04-2012, 10:59 PM   #6
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Hi Yes that is the correct oil to use in the MAG, also from barrus they say they do run low oil pressure, honestly there words at recertifiation course was "if it does not rattle its good"
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Old 03-04-2012, 04:21 PM   #7
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thanks tris. havent tried test gauge yet,hopefuly get out for a run tomorro.
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