Drop in oil pressure
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Cadillac Catera and Cimarron Forum Discussion, Drop in oil pressure in Past Cadillac Vehicle Discussion; I'm starting to feel like the blind men feeling the elephant. There are different solutions to almost all of our ...
  1. #1
    olddavid is offline Cadillac Owners Member
    Automobile(s): 93 Eldorado(sold)99 SLS(sold) 98Catera
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    Drop in oil pressure

    I'm starting to feel like the blind men feeling the elephant. There are different solutions to almost all of our problems unique to our automobiles. Yesterday, I installed my usual Mobil 1 5-20 with a Wix filter and have immediately noticed my oil pressure drop by 20%. I should point out I replaced the rounded out rubber o-ringed crankcase plug with an aftermarket copper-washered unit. It doesn't appear to be leaking in any way, but that is the only alteration done. Could it be the onset of oil-cooler leakage? I have no sludge in the coolant tank or the fill neck or on the dipstick, but the forum has mentioned that occasionally this takes time to make itself evident.Should I have this failure, is there any way to alter the design to put the cooler into a more conventional and more useful spot, like the transmission cooler? And, would there be a kit to accomplish this? High-pressure braided lines to a forward location - say, in intercooler territory? I'm rapidly losing patience, and had this car not had EVERY factory sponsored upgrade, I'm sure it would be in the breeze by now. This has been a challenge, to say the least, but I really enjoy it when its good. Plus, it's a one owner San Diego car that had 56k when I bought it, believe it or not, at a yard sale for $2750. Any input would be welcome.

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    gvjv3 is offline Awaiting Email Confirmation
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    Re: Drop in oil pressure

    5-20 is too thin of oil so it need less pressure to move, therefore your pressure gauge will show less pressure, try changing 10-30 or add a additive to thicken the oil

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Using thicker oil only raises the oil pressure, because it is harder to pump through the oil passages. Low oil pressure due to a weak pump, also means low oil flow, and that's the real problem. Using thicker oil does nothing to solve this, it only hides the symptom ) (the low gauge reading/oil light).

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    Submariner409's Avatar
    Submariner409 is online now If it won't run, slap in a big stereo
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    Re: Drop in oil pressure

    What viscosity oil is recommended in the owner's manual for that engine ?? Start there. Synthetic or conventional makes no difference, and WIX is the cat's meow for filters.

    Unless you race the car or tow large trailers you DO NOT need an oil cooler.

    Regular maintenance with modern oils, filters, and PCV systems has relegated the buzzword "sludge" to the garbage can of time.

  6. #5
    gvjv3 is offline Awaiting Email Confirmation
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    Re: Drop in oil pressure

    look at your manual, it stats to use 10-30, he has 5-20, too thin, put 10-30 in and if his gauge still is low, than check into the pump.

  7. #6
    jupiter57 is offline Cadillac Owners Member
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    Re: Drop in oil pressure

    Quote Originally Posted by gvjv3 View Post
    look at your manual, it stats to use 10-30, he has 5-20, too thin, put 10-30 in and if his gauge still is low, than check into the pump.
    10W-30, at the least.
    5W-20 is WAY too thin for almost any practical application except maybe in Alaska in winter!
    Bear in mind that if you have higher mileage, you will have bearing wear, which would necessitate a slightly heavier oil.
    I would recommend at least a 10W-30 or 10W-40.
    (Better to use 10W-30 in winter, 10W-40 in summer, IMHO)

  8. #7
    olddavid is offline Cadillac Owners Member
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    Re: Drop in oil pressure

    Thanks for all the input. I added a quart of 20-50 and my paranoia eased as my pressure returned to normal. I guess waiting for the other shoe to drop is too stressful for this old man. But I'm still vigilant as I've never known 5 basis points of viscosity to make a real difference in a completely healthy engine. Now on to the O2 sensors.

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