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So it was 150 rated oil. The dirty sample showed a 40C viscosity of 146 which was in spec. With each run through the centrifuge, it went up. The first run was only at 3k rpm... 180F temp and roughly 5 gallons per hour through the unit. The first test came back at 168 which was high limit...

Any ideas?

Hey alls, So I was approached by a company to try and help them clean up a sample of gearbox oil. They are getting severe levels of contamination (both water and particulate) in a relatively short amount of time due to the environment. They sent me a 5 gallon pail of their used oil to run...

Just found this... and oddly it's my short video. With that said... when you've been using one filter type for a decade on someone's vehicles... and the design changes substantially... it looks sub par.. and it's country of origin changes... it makes you question it's quality. I'm sorry that...

My ZT has over 500 hrs on it. Got it from a guy not running for $100... had dropped a valve seat. I replaced the complete head for $80 (ebay find new).. been running great since but it was abused before I got it. I mow ~2 acres. Any ideas on if the fill is accessible without pulling the units...

Hmm... is the vent/fill accessible with the drives in the chassis? If they are, I'm very tempted to add a 1/8npt drain to the bottom of the cases so they can be serviced regularly without disassembly.

Hey guys.. So my old ZT7000 (44") is starting to have issues with the transaxles. When the mower gets hot (after an hour or 2 of use), the trans wants to stop pulling. After it sits and cools, it'll be fine again for a couple of hours as long as it's not beat on. I'd really like to service the...

Currently, it has Delo 400 XLE 15w40 in the case. We're gonna let it ride for a month or two and pull a sample. Planning on switching over to Mystik JT-8 at that point as we can get it locally for a decent price (and meets the F1 standard)

Originally Posted by dnewton3 Looking at your UOA, there's no "best oil" that's going to stop the wear. Two choices here: 1) continue to run it until it stops running; might as well buy the cheapest lube you can find (any house brand 15w-40 or straight 30 HDEO) 2) stop running it now and fix...

I found that Mystik JT-8 is CI-4+ rated. Amsoil 15w40 Marine Diesel oil is CI-4 spec as well. Seeing good things on it. I'll likely switch some of the healthier engines in my fleet over to that in the future.

For some reason, this specific engine drinks all things Rotella. I'm talking 1gal+ per 2500 miles with no leaks. Delo and the problem went away. No idea why.

Originally Posted by Chris142 Switch back to a 15w-40 before you condem it. Walmart supertech works great in these engines as does tractor supply Traveller oil. Has 15w40 Delo back in it now. We'll run it 1k-1500 and send it off again to see how things are going.

Originally Posted by bullwinkle You're right about that, the F-450 IDI will run on almost anything, I've mixed in clean used (non-syn) motor oil, ATF, even clean used mineral refrigeration oil. I could turbo it, but I'm afraid the head gaskets wouldn't like it much. The truck weighs north of...

Originally Posted by BMWTurboDzl Looks like an old, tired, engine. I do agree that it's getting tired... but the spike with the different oil is what is bothering me.

Originally Posted by bullwinkle Like I said in the other thread-are you inexplicably losing coolant? Any white goop in the oil fill cap? Potassium & sodium both going up, in concert with lead, aluminum, & iron-it might be time to start looking for another engine for it, which might be...

Originally Posted by DoubleWasp What was the oil you changed at 274,125 miles? That was the change over to CK4 5w40. Thought it was a fluke so we let it go another interval. This truck doesn't get driven a bunch. As far as coolant loss goes... nothing noticeable. No drop in the radiator...

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5131308#Post5131308

Blackstone is saying the engine is showing a slow and painful death basically. I find it odd that all of this came up after switching from Delo 15w40 CJ4 to Delo 5w40 CK4. Thoughts? I'm also showing a slight coolant leak (likely oil cooler or head gasket). We're hunting for an engine at the...

Originally Posted by bullwinkle I would (AND DO) run garden variety 15W40, or even straight SAE 30, in a 7.3 IDI (like the '89 F-450 in my sig), I don't think I would use full syn 5W40 of any type in it, it would leak it badly & likely burn it too. I have to ask-have you been adding & monitoring...

Switched from Rotella 15w40 to Delo 15w40 due to oil consumption issues. For some reason, the IDI liked to drink Rotella but doesn't with Delo. After oil leaks were fixed, switched to Delo 5w40. I'll try to post it up in a bit.