Was I WRONG about COLD Idling?
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In today’s episode, we’re heading back to the chalkboard for a deep dive experiment testing cold idle starts vs. cold driving to heat up engine oil. To get the most accurate results, we logged each date, time, and temperature during testing for a detailed analysis!
But we didn’t stop there! We brought in special guest Lake Speed Jr. to test our oil samples and break down the science behind engine wear. Which method is actually worse for your engine? The results may surprise you!
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#ColdStartTest #EngineWear #OilAnalysis #MechanicScience #ShopExperiments
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45件のコメント
Use my link http://drinkag1.com/davesauto to subscribe and save $20 off your first subscription of AG1!
I’m not sure this says anything other than warm that engine up as fast as possible. Now do a test with one oil where the truck does multiples starts and stops over a day verses a truck that makes multiple stops but is left idling between stops over a day do the same oil test
What about gasoline engines? Any data on idling?
The sooner you get the engine up to operating temp the better for engine wear and oil performance, that means warming an engine up or cold idling will significantly reduce its life, that is basic common sense, but we have also completed several studies on this, you achieve this by driving the vehicle at slow speeds with minimal load, I have several vehicles with over 600k with no issues.-chief design engineer GM.
This is a nice conversation. I have been an engine repair and rebuild mechanic for 45 years . If an engine is cold the oil is not flowing as it should until it is warm. The engine parts also are cold and the tolerances are not up to operating temp. I have also been a truck driver .when the engine was cold we just get the engine going without reviving the engine .we would let the engine warm up before we would even start to move.
To idle or not to idle, that is the question.
You have to sacrifice somewhere.
Doubt worry total fear!
letting the engine warm up has always been a thing just stop ur useless dave
I never beat my engine until warm. Ive got 300k + on tdis twice. Royal purple or mobile 1 ext perf.
I like to be in Drive before the starter has stopped spinning.
This test was performed on a 5 year old ford truck that needed a new fuel system already. 👌
You Can't Drive When Your Windshield Is frozen up… and crap all over it. Toyota Even Says to warm the car before Driving. Change your oil every 5000 miles…
Can someone please explain why I've been doing just the opposite and letting my Toyota Tacoma with 424,000 thousand miles with no engine rebuild idle for 5 minutes before driving, and the oil has no dilution problems! I have an oil analysis done at a reputable company every now and then, and it always comes back in great condition. I do change my oil every 3,000 miles though.
is this for diesel trucks only sir
Snake Oil Salesman paying his way out of problems and the tests have flaws in the data. Even in Florida we are not starting it up and jumping in right away like the original video. Dave was wrong and still wrong just trying to sway customers. Really wants that TV show real badly and continues to take advantage of people.
Great video.
This is Epic and really backing up the best practice you have been mentioning.
So how does cold driving affect your transmission. Because when it’s minus 30 you can barely pour atf into a transmission
No, idling is severe duty.
Ok well here is the catch 22, it's not good for transmissions to start driving without sitting. The transmission valve bodies need a good minute of engine running time to allow the transmission oil pump to push fluid through the valve bodies so based on Your proven test here I would think we need a health balance of the 2 which I think is not going to work. I blame the car designers for this ahahahahaha, We need more efficiency between Engine and transmission correlation!
even my 6.4 power stroke will not cold idle. if I start it cold and let it sit for a minute it will rev up, the computer won't let it idle cold. I don't have a DPF anymore so I am not worried about that, but it is true that idling will coke those things up and ruin them. I run a third party penske truck rental facility and our new trucks have a timed shut off so you can't cold idle them. if you leave it running in park for a few minutes it will shut off the engine.
I just wait for my car to stop sounding like it just started. every car sounds like it's just woke from drowning and is spitting the water out and catching it's breath and then sounds "normal" eventually. i wait for it to remember what's going on
…that space heater would have made it nice and toasty and drained the battery pretty quick too.. so I wouldn't be going anywhere….! (Audi A3 TDi 8P1).
Does this mean more frequent oil changes? Possibly?
I think the real world test should be idle for 10 min and then drive to normal operating temperature, do that 3 times then do it cold start and drive for a while to normal operating temperature, that's how we really drive our trucks
SOP with my employees concerning my heavy equipment, including all diesel trucks is to start .. idle for 2 mim]nutes then go to operating power. Doing so has proven to be beneficial over the years I implemented this procedure. My Cat D10 engine if left to idle on cold start, won’t see oil temps rise much at all, but under load they come up into the green within a couple of minutes. When you-are talking about a $145,000 engine, you do what you van to increase longevity.
Dave, you recently did a video about lubrication quality of diesel fuel. I’ll add that my outfit adds motor oil, non synthetic to the fuel. One quart per 10 gallons. I have four F350s that have passed 200k miles, zero fuel pump issues. They are ‘16 thru ‘19.models. I source the cheapest standard oil, buy it in 5 gallon quantities averaging $1.75 a quart. It doesn’t cause issues with the exhaust filters. I do the same with my heavier machines as well. Only at overhaul ( 6000 to 8000) hours do I replace the fuel pump. Haven’t used any type of fuel additive ever, just the motor oil in fuel/
Thoughts?
I’ve never warmed up a vehicle unless I was taking an elderly person to an appointment but I drive a gas 5.7. Not sure if the gas and diesel make a lot of difference in this test.
Why not pour some AG1 in the crankcase? That snake oil garbage made me unsubscribe today. I am done.
Always beware a mechanic that only sees dollar signs as a reason to promote something.
Just use your car if it breaks get it fixed easy as that
Video could be 10min long how many times must we understand the vehicle is started cold 🥶 😅
2006 Dodge Ram 2500 Cummins owner here. Never ever my truck will warm up in idle only if I drive more than 20 miles start to warm up.
30° is not cold.
When we say we need to idle our trucks in Wyoming it's because it's minus 15° f. Like it is this morning.
I've never let my car or motorcycle idle more than 1 minute! 294,000 on my Element
Interesting test. The one thing I’d note, when I was running powerstroke, they always had a high idle switch on them, would idle them up to 12-1400rpm. I’d imagine the engineers at ford acknowledged by including that feature it’s better to get a diesel working lightly than just idling at 550-750rpm.
I need help. I would greatly appreciate your time. I have written to YouTubers but to no avail. I just bought a 2018 Nissan Titan XD 5.6l V8, 87,000 miles. The motor has a terrible knock (not tick). Should I dump $ into the motor to fix the knock or just have a new motor installed? Thank you kindly for your time. Greatly appreciated, truly.
None of these videos address rural residents in cold climates. I'm not hopping on the highway with a -25° engine that can't defrost the windshield.
Okay, this is a great test of something that has been published before… But I'd love to see the test redone at higher idles
Is fuel in oil more an issue due to the high psi direct injection systems on modern cars?
Great info!
“Maybe I was wrong.”
Yes.
Other problem with idling is that's a very quick easy way to have your car / truck nicked! Then oil dilution won't be a problem!
Shouldn't be no fuel in the oil. Either way unless you got a bad problem
Does this apply to gasoline engines too?
Detroit Diesel did a very intensive study in the 1990's, EXCESSIVE-IDLING was the largest contributor to long-term wear, in an otherwise properly maintained engine. Idle-UP.