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how can one tell 100% that the oil was changed #5289045 12/09/19 03:22 AM
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WhyMe Online Content OP
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was over at my sisters house helping her with something . while there i took a look as her vehicle . i checked the oil and it was dark and about 1/2 quart low. i asked her when she got her oil changed last. she said she just got it changed at the toyota dealer a couple of days ago. i looked a the reciept and she has put about 60 miles on it since.

looking at the oil i am suspicious if they changed it or not. two things got me. the color and the 1/2 quart down. i told her my suspicions and she asked how do we prove it? So that is the question. how does one prove that oil was never changed ?

Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289047 12/09/19 03:30 AM
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LvR Offline
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If you know the brand and spec oil supposedly used send off for a UOA and compare with whats found ............... else all bets off imo

Last edited by LvR; 12/09/19 03:31 AM.
Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289050 12/09/19 03:56 AM
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Sayjac Offline
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You may want to read the recent related topic thread, linked. I'm thinking even 'if' one could prove it wasn't changed, honestly not much to be gained imo. If you and your sister have serious doubts about the oil being changed, my advice, go elsewhere in the future. And chalk it up to experience.

https://www.bobistheoilguy.com/foru...id-they-really-change-my-oil#Post5275061

Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289063 12/09/19 05:01 AM
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Imp4 Offline
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A drain and fill while leaving the filter on costs about $15 and 15 minutes of your time.
Maybe worthwhile for the peace mind...


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289064 12/09/19 05:02 AM
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Triple_Se7en Offline
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Familiarity with the vehicle is the best evidence. One should know how the oil dipstick looks right after multiple oil changes. One should know what the dipstick looks like 1K into the OCI, evidenced by multiple oil changes.

Past history is the best way to acknowledge something went wrong with that just recent oil change. I just went thru this with my Hyundai dealer, after getting my (1) free oil change. The vehicle returned to me had dark oil - not clear. Appears as if the bolt was removed - a new washer inserted and then screwed back on. Looks like I received three new quarts of oil, instead of five.

I argued with head of mechanics for a few minutes over the phone. Told them they will never touch that oil pan bolt again, on my dime. I changed the oil again the next day. Put in five quarts of Valvoline Advanced Synthetic. Dipstick is super clear again, almost 1K later.


19' Hyundai Santa Fe 2.4 GDI - Valv Adv. 5w30 / OEM Oil Filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Pennzoil Gold 5W30 / OEM filter
04' Colorado 3.5 Castrol Edge 0W40 / K&N filter
Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289081 12/09/19 06:04 AM
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demarpaint Offline
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These threads seem to be popping more frequently, here's my take. Proof it was changed beyond a shadow of a doubt comes in two forms. 1. DIY. 2. Watch the person who does it. Unfortunately anything else is based on trust, a hunch, or pull a sample and perhaps analysis can shed some light.


God Bless Our Troops

Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289091 12/09/19 06:23 AM
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Eddie Offline
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I agree with dermapaint. I do my own oil changes but, let the dealer do the first free one. However, the dealer whisks the vehicle away to a stall where you only see the tail lights. I ask to be at the car and was told NO. End of any future dealer service except warranty work. Ed


2014 CX5 Touring 2.5L :-)
Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289097 12/09/19 06:32 AM
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BMWTurboDzl Offline
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Answer: Blot Test.

Just blot some oil on a piece of white paper and let it dry. Dirty oil will dry black. Newer oil will dry an amber to light brown color.

Blot Test

Last edited by BMWTurboDzl; 12/09/19 06:32 AM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

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Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289150 12/09/19 07:53 AM
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DIY is the only way to know for sure. Most garages won't let you in the bay due to liability issues.


2016 Honda Pilot EX-L with NAVI.....Mobil 1 0w20 AFE and Honda OEM Filter
Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289156 12/09/19 08:02 AM
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set hidden camera under facing the drain plug... review footage after.
or best of all DIY!!!
Blot test is kinda ok, but if they didn't let it drain all the way could give 1/2 false reading.


19 accord 6sp 2.0T
04 5.9 cummins
95 12V NV4500.
11 ranger 4.0
18 crf450RX
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Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289196 12/09/19 08:58 AM
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I can’t answer your question, but I would go ahead and drain and refill with new oil just to be sure. Toyota dealer didn’t change the filter on my brother’s Tundra once. Needless to say he does his own oil changes now. Toyota corporate got a call about that one. smile





Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289227 12/09/19 09:34 AM
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While a dealer or shop might not let the old oil drain for 6+ hours to get every possible last drop like some feel is necessary, how do they really benefit by pulling a car into a bay, hoisting it up, and doing nothing ? They save $10 by not changing either the oil or filter ? It makes little sense for them not to do the work....

Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289231 12/09/19 09:36 AM
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I have trouble reading the dipstick on my 180k mile Mazda 3 after an OC for about 500-600 miles because the oil is so lightly colored and transparent. So if the oil is obviously dark only after 60 miles, chances are it was never changed. And I don't think you need to prove to the dealer it wasn't changed.
I would simply go to them, show them the oil color and see their reaction. If they value their reputation, they will change the oil with no to little fuss.


If not, simply don't use their services.


2015 Grand Caravan 3.6L - 35k miles.
2006 Mazda 3 2.0L - 186k miles
Re: how can one tell 100% that the oil was changed [Re: hallstevenson] #5289245 12/09/19 09:53 AM
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PowerSurge Offline
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Originally Posted by hallstevenson
While a dealer or shop might not let the old oil drain for 6+ hours to get every possible last drop like some feel is necessary, how do they really benefit by pulling a car into a bay, hoisting it up, and doing nothing ? They save $10 by not changing either the oil or filter ? It makes little sense for them not to do the work....


Sure it makes sense, especially when you figure they change oil on hundreds of vehicle every month. A filter here or there, oil not changed here or there. That’s huge $$ every year. The Toyota dealer here was busted because I had Steelman Security Seal on the oil filter housing.





Re: how can one tell 100% that the oil was changed [Re: WhyMe] #5289248 12/09/19 09:53 AM
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What vehicle are we talking about? That would likely help. In my experience, the oil should look a light amber, but I only have experience with 2 Toyotas (corolla and venza).


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967
2015 Toyota Venza Parisian Blue Pearl 25k miles
TGMO 0W20 & OEM filter

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