Caterpillar: I mixed some 80W-90 oil with my 15-30 in the reservoir. Is this going to hurt my engine?

heavy engine

Question:

I mixed some 80W-90 oil with my 15-30 in the reservoir. Is this going to hurt my engine?

I asked a question about this earlier but some investigation has led me to find that in fact I put some TRAXON 80W-90 oil in my reservoir which already contains some 15W-30 oil. Is this going to stress the oil pump or otherwise cause damage to my engine?

This is for a heavy truck (Western Star) with a CAT engine. And yes…I’m as smart as a bag of hammers I know.

Answer by Mr. T
Gear oil has different properties than engine oil. If it’s only a quart, I wouldn’t worry. Any more, I dump the engine oil & refill along with new filter(s)

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4 Responses to Caterpillar: I mixed some 80W-90 oil with my 15-30 in the reservoir. Is this going to hurt my engine?

  1. mdk68gto says:

    that heavy an oil will cause a change in fuel economy, and poses a risk on the main seals, out side of that, i would just drain the tank and the rest of the oil and just do a full oil change. the lubrication system does contain a pressure regulator that will drop the pressure to a specified range but that thick of oil will be, well load on the engines internals never mind that the additive package is designed for gear boxes.

  2. therapy_reject says:

    It depends on how much you put in, if its just a little bit I wouldnt worry too much. But if you put in a lot it can cause some damage.

    Personally, I would be on the safe side and just drain it all and put in the proper oil.

  3. Ben Linus says:

    Be safe and drain the oil mixture ASAP and refill with new 15w-30. Whatever damage has already been done (if any) can’t be undone, but you can prevent any further damage being done by changing out the thicker mixture before driving it again.

    You can damage any number of engine parts by running a thick gear oil instead of an engine oil including the oil pump. The thicker oil won’t circulate around the engine as easily as motor oil, so any surface normally lubricated by motor oil is vulnerable. If you did something like added a quart of gear oil to a bunch of motor oil, the likelihood of damage is much lower since the mixture will still be fairly thin, but better to be safe than sorry and just change it all out.

  4. Texas Underdog says:

    What “reservoir”???
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