# Why is LetSuck 2024 RX350h oil drain not at the bottom of the sump? **URL:** \ **Category:** General Discussion\ **Created:** [July 23, 2024, 3:56pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401 "2024-07-23T15:56:15Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Robert-Gift](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/robert-gift/32/356_2.png) [@Robert-Gift](https://community.cartalk.com/u/Robert-Gift)\ **Post date:** [July 23, 2024, 3:56pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/1 "2024-07-23T15:56:16Z")
Even with the SUV front wheels up on ramps, the oil drain opening is not at the lowest point. Is there a reason some oil is retained? Guess I will have to hang a pipe cleaner to wick the remaining oil out over night. OCD Robert. **O** il **Co** mpletely **D** rained ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [July 23, 2024, 4:15pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/2 "2024-07-23T16:15:01Z")
> [@Robert-Gift](#): > > Is there a reason some oil is retained No, because it does not matter. > [@Robert-Gift](#): > > Guess I will have to hang a pipe cleaner to wick the remaining oil out over night Go right ahead and You do You. 🙄 ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [July 23, 2024, 4:23pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/3 "2024-07-23T16:23:52Z")
I hear the Bomb squad is looking for help, OCD required… ---
**Author:** ![Robert-Gift](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/robert-gift/32/356_2.png) [@Robert-Gift](https://community.cartalk.com/u/Robert-Gift)\ **Post date:** [July 23, 2024, 4:45pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/4 "2024-07-23T16:45:03Z")
Matters when all of the used oil could easily be drained, especially when Lexus boasts 10k changes. 4.2 qts without new filter 4.5 qts withew filter 5.6 qts dry If the oil plug were on the very bottom it could be hit by something on the road. But th.is on the rear wall of the oil pan which is above a bottom cover. A cover panel must be removed to access the oil plug and filter. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [July 23, 2024, 4:48pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/5 "2024-07-23T16:48:46Z")
RG just go away all you do is post the same nonsence that no one with half a brain will agree with. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [July 23, 2024, 4:55pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/7 "2024-07-23T16:55:15Z")
> [@Robert-Gift](#): > > Matters when all of the used oil could easily be drained No, it does not matter because you can STILL change at 10K. It only matters to you. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 23, 2024, 5:14pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/8 "2024-07-23T17:14:34Z")
> [@Robert-Gift](#): > > Matters when all of the used oil could easily be drained, especially when Lexus boasts 10k changes. Have you had a problem with 10,000-mile oil changes? > [@Robert-Gift](#): > > 4.5 qts withew filter > 5.6 qts dry That is the reason this does not matter. There is one quart of oil in the oil galleries, camshafts, crankshaft, camshaft actuators and oil cooler, 0.1 quart of oil remaining in the oil pan is insignificant. You might not believe how much oil remains in the top end of an engine unless you disassemble one for yourself. ---
**Author:** ![STZ](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@STZ](https://community.cartalk.com/u/STZ)\ **Post date:** [July 23, 2024, 5:14pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/9 "2024-07-23T17:14:51Z")
Watched a YouTube video last night, some Chevy truck I believe, insane amount of disassembly to remove the valve cover. I kid you not, you had to first remove the oil pan, then work your way up the engine (alternator, A/C, steering, ect.) before you had access to all the valve cover bolts and room to pull it off. Found the video! [![](https://global.discourse-cdn.com/cartalk/original/3X/0/a/0ae73cb4ad80de5895128c96c8c8743e9bcca752.jpeg "This is Why GM Hates Its Customers") ](https://www.youtube.com/watch?v=x-oKPUopAWM) ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [July 23, 2024, 5:17pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/10 "2024-07-23T17:17:21Z")
And what does that have to do with a simple oil change STZ ? ---
**Author:** ![STZ](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@STZ](https://community.cartalk.com/u/STZ)\ **Post date:** [July 23, 2024, 5:25pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/11 "2024-07-23T17:25:27Z")
Another example of poor engineering that will likely shorten the life of the vehicle. A design where “changing the oil” leaves a quart (18%) of dirty oil in the engine…brilliant! I’ll bet there’s a “special tool” that costs $$$$ to get that oil out…lol! ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 23, 2024, 5:28pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/12 "2024-07-23T17:28:09Z")
> [@STZ](#): > > A design where “changing the oil” leaves a quart (18%) of dirty oil in the engine…brilliant! There is about 4 ounces remaining, have you ever removed an oil pan? ---
**Author:** ![STZ](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@STZ](https://community.cartalk.com/u/STZ)\ **Post date:** [July 23, 2024, 5:29pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/13 "2024-07-23T17:29:37Z")
That 4oz is the worst 4oz…and you’re ok with removing the oil pan to get it out? My gosh, this world… Oh, and… 4.5 qts with new filter 5.6 qts dry That’s 1.1 quarts… ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [July 23, 2024, 5:31pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/14 "2024-07-23T17:31:04Z")
> [@STZ](#): > > That 4oz is the worst 4oz…and you’re ok with removing the oil pan to get it out? This has been the case since the beginning of time, and plenty of engines run for 300k or more. 4oz or 8oz of used oil has NO impact on engine wear. ---
**Author:** ![STZ](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@STZ](https://community.cartalk.com/u/STZ)\ **Post date:** [July 23, 2024, 5:33pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/16 "2024-07-23T17:33:01Z")
> [@Robert-Gift](#): > > Yes, much remains in the engine - which is why I drain overnight and fill in the morning Yep! That’s the ticket. Those “fast lube” places…no thanks! ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 23, 2024, 5:34pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/18 "2024-07-23T17:34:41Z")
> [@STZ](#): > > Oh, and… > > 4.5 qts with new filter > 5.6 qts dry > > That’s 1.1 quarts… That oil in not in the oil pan, it is in the mechanical parts of the engine. > [@Nevada\_545](#): > > There is one quart of oil in the oil galleries, camshafts, crankshaft, camshaft actuators and oil cooler, 0.1 quart of oil remaining in the oil pan is insignificant. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [July 23, 2024, 6:00pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/20 "2024-07-23T18:00:12Z")
Probably made things worse doing that. One quart old plus 4 quarts new works fine, has for decades. I’d bet $100 that there would be no detectable difference in engine wear between the drain it for 5 minutes and drain it overnight methods. ---
**Author:** ![STZ](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@STZ](https://community.cartalk.com/u/STZ)\ **Post date:** [July 23, 2024, 6:06pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/21 "2024-07-23T18:06:50Z")
> [@Nevada\_545](#): > > That oil in not in the oil pan, it is in the mechanical parts of the engine. The point is **the design** leaves 20% of the dirty oil in the engine. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 23, 2024, 6:27pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/23 "2024-07-23T18:27:37Z")
> [@STZ](#): > > The point is **the design** leaves 20% of the dirty oil in the engine. Toyota engine have been this way for 25 years, and Bob is the only one looking for a solution. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 23, 2024, 6:54pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/25 "2024-07-23T18:54:42Z")
The oil in the oil pan is insignificant compared to the oil retained in the top of the engine. After draining the oil overnight, the oil is still held in the galleries and camshafts. I have disassembled many engines after at-rest for 24 hours. The picture below shows how much oil remains in the oil pan after draining from the drain plug. ![20230909_155714](https://global.discourse-cdn.com/cartalk/original/3X/9/0/9009ceb4a2d8adab6492b5b76893fc7ca0aa40ff.jpeg) There is a slot in the bottom of the drain plug flange to allow more oil to drain. ![image](https://global.discourse-cdn.com/cartalk/original/3X/0/2/02916d8b8803d7effe3d4a5bdfef104974a0b68a.jpeg) ---
**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\ **Post date:** [July 23, 2024, 7:31pm UTC](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401/26 "2024-07-23T19:31:33Z")
> [@Nevada\_545](#): > > The picture below shows how much oil remains in the oil pan after draining from the drain plug. Is that a wrist pin, part(s) of a connecting rod, a piston in many small parts, oil control ring and a wrist pin retainer in the bottom of the pan?? with maybe some of the block thrown in for good measure?? I bet the cylinder wall was pretty… lol [Next page](https://community.cartalk.com/t/why-is-letsuck-2024-rx350h-oil-drain-not-at-the-bottom-of-the-sump/195401.md?page=2)