Gear oil in an engine... it actually happened.

[crazyoildude]

gear oil in that engine = no circulation it was the gear oil for sure
On the other hand he said he built engines he should have heard the knocking at startup and he should have seen the oil lite

 

[SuperDave456]

I replaced the 75w-140 Gear oil in the rear differential of the 1998 F150 that I recieved a couple years back.

Both the Factory Synthetic 75w140 that I had in it, and the Amsoil Severe Gear 75w140 that I replaced it with was nowhere near as thick as whatever that guy had in his engine.

Something stinks here... I'm pretty sure there may be Gear Oil in that concoction, but that is something closer to STP or one of Lucas's products.

And for a guy that "Has built engines all his life" he should know better.
He should be dropping the pan and scraping that junk out instead of just trying to get hot oil to dillute it.

Personally, I think this guy is a bozo and there is more going on than what he is telling us.
I also think all Iffy Lubes are one step above a Chop Shop, but that is my opinion.

 

[LineArrayNut]

Soooo, I got po'd at my oil burning mazda b2000 and ... yep, put gear oil in it when I was out off top off and the light was flickering. It was burning a qt every 2 fill ups. Didn't seem to bother it a bit. I sold it for $400 a coupla months later.

 

[Pablo]

No comments on the oil filter?

What does come out does not have the same apparent viscosity as what is coming out the drain hole.

If I was the head guy at Flynn's I would have sampled it myself. I think something stinks at the Canadian border. Just saying.

 

[UNC017]

Originally Posted By: KCJeep


Good info again 440 thanks! My current Jeep has the 4.0 but I read about quite a few issues with the 4.7 in the WJ's (99-04). My next Jeep may indeed have the 4.7 so I appreciate the info...thinking maybe 2010 Commander so that would be second generation.

Frankly nothing is going to touch the 4.0 for longevity. But, its gone so we have to move on. I think the 4.7 is a very good engine, especially the 2nd gen. It did have some teething issues in the early years I guess, but people forget that the Ford Modular also had issues (astronomical oil consumption on early 5.4s for example). The valve fingers popping out of place and even breaking parts of the head casting seems to be the most common thing I read about with the first-gen engine.

The bottom end is built like a tank. Bearing caps are integral to a ladder-style block bedplate, and the oil pan bolts below that. Really stout for such a small displacement engine, and it gives me the impression that its built with the intent that it will work hard and hold high RPM for extended times in the truck application. Not the greatest truck engine idea, but certainly effective in a half-ton that hauls but doesn't tow all the time. I've towed with mine, and I do hold either in the first overdrive or direct (button selectable as 'tow/haul' or 'OD/off') when towing. The engine doesn't seem to mind, I just have to re-tune my ears to the different exhaust pitch. If I were buying a new half-ton truck right now, I'd opt for the MDS 5.7 instead- there's just no downside. 80 more horsepower for the same fuel mileage. But I wouldn't hesitate to buy a lighter Jeep with a 4.7.

 

[mechtech2]

Originally Posted By: djb
Hmmm, far from home and just drove 18 hours straight. There must have been an indication that something was wrong to opt for a flush rather than a simple oil change. Or to get an oil change at all when on a trip.

There must be more to the story.


Right. No one flushes without a reason.
But the gear oil is to blame!
The service place will get all the blame, for a car 99% already faulty.

 

[TrevorS]

Whatever that stuff was it came out clean so I'd say Flynn's did a good job on the flush part!