An auto repair shop put conventional oil in my car when s...

An auto repair shop put conventional oil in my car when synthetic oil should have been used. What should I do? Mechanic's Assistant: When was your last oil change? Last Friday. Mechanic's Assistant: What is the ma...

An auto repair shop put conventional oil in my car when synthetic oil should have been used. What should I do? Mechanic's Assistant: When was your last oil change? Last Friday. Mechanic's Assistant: What is the make/model/year of your car? 2005 Chevy Corvette Mechanic's Assistant: Are you fixing your Corvette yourself? What have you tried so far? I haven't done anything yet and am looking for instructions on the right course of action.

Automotive Expert
Welcome to JustAnswer. My name is \*\*\*\*\* \*\*\*\*\* I will be doing my best to help you. You will be given an automated offer for a phone call. You may accept or decline that offer. I do not personally offer this service so if you take this offer another tech may call I’m sorry that you’re having trouble with your vehicle. Please understand that I do not know your knowledge or capabilities so I may need to ask questions to gather addtional Information. My goal is to provide you the best service possible . If you have any questions or concerns, please don’t hesitate to let me know. It may take a minute or two for me to respond because I may have to pull up information . Thank you for your patience and will reply as soon as possible. Hello, how long/ how many miles since reg oil was put in and curious what did they use brand and viscosity

30 miles since reg oil was put in. ACDELCO SW-30 CONV
Automotive Expert
Ok, back shortly
Automotive Expert
Ok, I realize factory oil was Mobile 1 Synthetic and Synthetic is required in 5W-30 or 10W-30. Now, you will be fine just doing another oil change, The tiny little bit left in [engine](/topics-engine-chevy/) is nothing that will not mix nor hurt the synthetyic going back in., I do not feel any damage was done but that stated is between you and the shop. We swap out Conv to synthetic all the time and is norm in the industry. No harm done at all if you do another oil change since so little miles since wrong added. One may? want to let the engine sit for a couple days prior to oil change to allow near all oil to drain back to oil pan and then you are good. Hope this makes sense

Questions: 1. Please explain your statement, "We swap out Conv to synthetic all the time and is norm in the industry." 2. You have recommended letting the engine sit for a couple days prior to the oil change to allow all oil to drain back to oil pan. I will have to drive the car back to the shop to get the oil changed. Given such, I'm assuming that I should instruct the mechanic to wait a few days before performing the oil change to allow all the oil to drain back to the oil pan? 3. My repair invoice states that the aforementioned regular conventional oil was used. It's possible that the mechanic will now claim that: (a) synthetic oil was used; and (b) a 'typo error' was made on my repair invoice. If the mechanic claims such, can I get the oil analyzed to verify such and if so, can you tell me where I can get the oil analyzed to address this issue?
Automotive Expert
I will try to explain, back shortly with advent of synthetic oils and semi synthetic oils many consumers decided to change from conv to synthetic and it is perfectly acceptable to do this./What little is left in engine will intermix and all is just fine,. Your engine has different design tolerances and thus why synth is what is required. Its by design and I do not know everything about that.I am trying to say.. with the exeption of the 2 oil cooler tubes that may hold a few tablespoons, if it is allowed to sit at least 24 hours after you drive there IMO that will allow the most oil to drain back to oil pan.Again what little bit sitting on top of the heads is nothing that will not intermix and you will be fine doing an oil change. If you can pull it off with the shop? 2 oil changes and problem is 100% solved. Do one run till warm, turn off and do another, It will be expensive and shop should consider? doing this As far as oil analyize? I do not know,. I never had to send any out, insurance companies do this and maybe call one /yours and ask a claim adjuster, Just a thought. As far as invoice? I would go on what they wrote and demand 2 oils changes to do as much flush as possible. I really can not help with that. 30 miles, conv oil and doing a correct oil change? your fine.,If you had driven thousands? that could affect long term life of the engine

Thanks Randall C. So I can show my mechanic your written advice, can you provide your: (1) last name or ID number; and (2) place of employment?
Automotive Expert
We are not permitted by Justanswer to provide personal information. I am sorry. Its by their rules and I can understand that as we experts/techs could be caught up with direct communication with customers outside of this format. You can provide my advice to them , your call but what I sent is my opinion and some may feel different. I have been a master tech for 38 years so not new to this. I do my best to try and help. I am in no position to try and pick a side, I can only explain what I did and my feelings on correction. As you know the fight is on your end.I feel your fine if things followed but.. you may not feel comfortable with that so you need to work it out with the shop if?? they made the errorand you need future protection and what I feel you want

Thanks again Randall. Take care.
Automotive Expert
feel free to keep me in the loop. This post does not close, so maybe book mark it, Here to help the best I can

What others are asking

Car keeps stalling.
A check engine light is warning that their is some fault in the pcm or other sub computers, the fact that its stalling and a cel (check engine light) is illuminated tells me there is definitely a problem with either...
Car won't start
Try to move the steering wheel back and forth while turning the key. You may have bound up the steering lock when the vehicle was parked. If the key turns okay now, then the vehicle should start. If the steering...
Dual cooling fans issue
The cooling fan motors should both come on together. The cooling fan controller will control the speeds of the fans with input from the engine control module. Your fans are controlled by the fan controller on the fan motors (
Left dipped headlight/main
Hi there. If you are lucky this is just a bad bulb ( If the bulb filament failed, the module will notice turning this light on. Most of the time, though this is a failure in the ballast for the...
why am i loosing power, spits and sputters then is fine.
Hello. It sounds like you may have several different problems with this vehicle. The starting issue sounds like you may have a failure in the fuse box ( or in the starter relay (, most of the time though it...
Hi there. Your question for replacement cost of your vehicle's PCM (powertrain control module, is difficult to answer (new, remanufactured, used). Typically, the PCM is not a component that fails, and will most likely require programming once replaced. It could...
Can I use back door handle for the front door handle inside and out, if so how?
I would recommend against doing this. Most vehicle door handles are not compatable from front to back. If you have a junk yard near your location, you can usually get parts such as door handles very inexpensively. I would recommend...
2015 BMW 750 Lacks Power
There are many potential causes for your concern. If the check engine light is on, (I'm guessing it is) the first thing you'll want to do is retrieve the diagnostic trouble codes. These codes serve as as starting point for...
My truck has been giving problems to start, and I end up getting a jump. However, my battery, alternator and starter are good
If there is no starter motor operation, check for presence of 12 volts at the starter solenoid when the key is held in the start position. Check for voltage drop on the heavy gauge wire from the battery to the...