cold drain vs. hot drain
- Thread starter SamMan23
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I always do it hot and never been burned.
I have always changed the oil in the morning after everything has cooled down. So far it has not caused any problems for my 1995 Honda Accord. I just went over 215,000 miles and it doesn't use any oil. Will the cold oil changes keep me from hitting 300,000? I doubt it. I must say that the Americans that built this car sure took pride in their workmanship...
yes! that is one reason I drain when hot. cold drains result in an extended "dry" period while the filter refills & before oil pressure reaches the top end. basicaly an extra harsh cold start.
Well, I gave it a try... drained the oil cold. I'll let you draw your own conclusions. I always use a litre of Mobil 1 0W20 and 2.5 litres of Mobil 5000 5W20. I have a Honda Civic Hybrid. The drain usually takes about 45 minutes. It was still slowly dripping out two hours after I started. I always pour a couple of tablespoons of fresh oil at the end to see if there is any deposits/gunk in the pan. The extra oil has always come out just as it went in - clean. This time, after two hours, I put in my normal couple of tablespoons of fresh oil and out came more black gunk,tried it again - same result. I used about half a litre before it started running out clean again.
Originally Posted By: ALS
Well my owners manual says change it when it is warm.
Volvo owners manual
Volvo doesn't want you burning you self.
Well my owners manual says change it when it is warm.
Volvo owners manual
Volvo doesn't want you burning you self.
Originally Posted By: AllenWalker
Quote:
Well, I gave it a try... drained the oil cold. I'll let you draw your own conclusions. I always use a litre of Mobil 1 0W20 and 2.5 litres of Mobil 5000 5W20. I have a Honda Civic Hybrid. The drain usually takes about 45 minutes. It was still slowly dripping out two hours after I started. I always pour a couple of tablespoons of fresh oil at the end to see if there is any deposits/gunk in the pan. The extra oil has always come out just as it went in - clean. This time, after two hours, I put in my normal couple of tablespoons of fresh oil and out came more black gunk,tried it again - same result. I used about half a litre before it started running out clean again.
Very interesting.
There is no real advantage in what is being done.
Quote:
Well, I gave it a try... drained the oil cold. I'll let you draw your own conclusions. I always use a litre of Mobil 1 0W20 and 2.5 litres of Mobil 5000 5W20. I have a Honda Civic Hybrid. The drain usually takes about 45 minutes. It was still slowly dripping out two hours after I started. I always pour a couple of tablespoons of fresh oil at the end to see if there is any deposits/gunk in the pan. The extra oil has always come out just as it went in - clean. This time, after two hours, I put in my normal couple of tablespoons of fresh oil and out came more black gunk,tried it again - same result. I used about half a litre before it started running out clean again.
Very interesting.
There is no real advantage in what is being done.
I drain it hot about 15 minutes after a good run, never got burnt until I changed it on the 08 Liberty. 3rd degree burn from the cat on my forearm, ouch! Next time I'll wear a sweat shirt instead of a T-shirt.
Frank D
Frank D
What I hate is having to play hot potato with an oil filter and trying not to get oil all over myself.
I think I'm going to start letting them drain for an hour before taking the filter off.....
I think I'm going to start letting them drain for an hour before taking the filter off.....
I always change it hot.
I prefer to change oil while it is ambient(90f) to warm but never hot. I am not in a hurry and I don't care for fighting hot oil. I see no difference in a hot and cold drain other than the risk of burns. Now for taking an oil sample for analysis I will state hot oil is of course prefered.
Drive it to full temp, let it sit for an hour or so. Change it around 150F.
All else equal, wouldn't hot oil that's recently been swooshing through the engine have more contaminants in suspension than cold oil that's been sitting in the sump for hours? I'd think stuff would precipitate out as the oil sits and temps drop.
Hot drains with a Fumoto valve are quick and easy, but the hot filter IS a pain in the rump.
Hot drains with a Fumoto valve are quick and easy, but the hot filter IS a pain in the rump.
I think the idea behind changing your motor oil hot is valid. Based on readings, particles get suspended in hot oil, whereas they may settle after cooling. (Dang, looks like the last post beat me to it!)
Can't hurt to get the most possible out. That, and latex gloves really help with hot filters.
Can't hurt to get the most possible out. That, and latex gloves really help with hot filters.
Originally Posted By: tropic
All else equal, wouldn't hot oil that's recently been swooshing through the engine have more contaminants in suspension than cold oil that's been sitting in the sump for hours? I'd think stuff would precipitate out as the oil sits and temps drop.
100% true.
In addition, more oil will drain out when hot, because the cold oil sticks to internal engine parts and flows to the bottom much more slowly.
Drain your oil as soon after stopping the engine as you can. Get the oil as hot as you can safely handle, then drain very promptly. If you're anal about it, let the oil drip for a long period of time...worthless tactic, but if you feel better, do it. Ditto for wasting a quart of new oil through the engine to wash out old dirty oil.
All else equal, wouldn't hot oil that's recently been swooshing through the engine have more contaminants in suspension than cold oil that's been sitting in the sump for hours? I'd think stuff would precipitate out as the oil sits and temps drop.
100% true.
In addition, more oil will drain out when hot, because the cold oil sticks to internal engine parts and flows to the bottom much more slowly.
Drain your oil as soon after stopping the engine as you can. Get the oil as hot as you can safely handle, then drain very promptly. If you're anal about it, let the oil drip for a long period of time...worthless tactic, but if you feel better, do it. Ditto for wasting a quart of new oil through the engine to wash out old dirty oil.
I drain my oil out after a long drive and sometimes heat the new oil up in a bucket of hot water. I want every drop I paid for!...Actually..the job goes faster pouring in hot(warm) oil.
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