Originally Posted By: hate2work
Originally Posted By: SteveSRT8
X2 ^^^ There's your documentation.
I'd be really concerned with a cold change for the above and this additional reason: if you are not able to prefill the filter your engine is running a long time without oil pressure.
The full and fast drain of a HOT sump is another reason we are no longer using Fumoto valves. The bottom of the sump was building up a layer of stuff I had never seen before!
I'm afraid it was due to the tiny trickle that those things flow compared to the stock drain hole.
Nope, engineerscott's post is simply more of the same anecdotal stuff that gets repeated time and again. For the record, I'm not bashing anything scott or anyone else has said about this, I'm only saying that I've never seen any scientific documentation that it's beneficial to your engine to drain your oil when it's hot.
RE; Fumoto valve...Before installing mine I measured how deep the threads were in my oil pan, and when I found out the threads on the valve would be too deep, I cut a cross in the top of the threads with a very small grinder. Then, after using the valve for the first oil change, I removed the valve and there was zero oil left in the pan.
Your Fumoto only produced a tiny trickle? Maybe there was something wrong with it, cuz mine empties my 6 quart sump in about two minutes or so, although I've never timed it. And, if you think about it, as soon as it starts dripping it's the same as the full sized drain hole, cuz oil drips from a 1/4 inch hole just as fast as it does from a 1/2 inch hole.
Also, you mentioned your concern about a cold oil change in regards to not being able to pre-fill the filter? What did you mean by that???
No biggie, the reasons are simple physics, hot oil can hold more contaminants than cold oil. Hot oil drains faster than cold oil.
I own dozens different machines with Fumoto valves on them. All are oil filled, like the engines on cars. Some are industrial equipment. But on my Savana Vans the Fumoto drains at about half the rate or less than the stock opening. I've never timed it but it's less than a minute for sure. Since we were experiencing a "scum" on the bottom of the pan that I have never seen before in ANY of my engines (verified by one that was pulled for overhaul)I am removing the F valves and watching carefully. You should, too. Check the bottom of your sump lately, Fumoto users?
BTW, I like the trick of checking the depth of penetration. I will check that, too.
And we pre-fill the filters on vehicles that allow it. This prevents you from running for many agonizing seconds with no oil pressure!
