Mixing 0W-20 GF-5 and 0W-20 GF-6A Engine Oil

3rd gen 2018 Tacoma Off-Road Access Cab.

I used to buy 0W-20 ILSAC GF-5 Mobil 1 Extended Performance Full Synthetic Motor Oil 15k miles - 5 Qt in bulk. (images attached)



In order to do an oil change, 6+ qts is needed, so I just would empty a 5 qt jug plus draw the extra 1+ qts from another of the 5 qts jugs. That of course leaves oil left over.


I have only 4 qts left, so I now need to buy more oil for my next oil change, however this oil is no longer available.

The closest replacement seems to be the below. Still 0W-20 but now with the new GF-6A standard.

$41 Mobil 1 Extended Performance Full Synthetic Motor Oil 0W-20, 5 Quart

https://www.amazon.com/dp/B00JTUBTQG/?coliid=I14KUM7R9I6P1X&colid=3OH25GDE1URHQ&ref_=lv_ov_lig_dp_it





The GF-6A standard states that it is backwards compatible with GF-5.

So, am I good with combining my remaining old Mobil 1 Extended Performance 15k miles 0W-20 GF-5 with the new Mobil 1 Extended Performance 20k miles 0W-20 GF-6A?

 

You're fine. The engine is not that sensitive to fluid standards.

 

No problem at all

 

So sorry to hear about your eminent loss...

Maybe we should start the parting out process...




You're fine. Nothing to worry about.

 

Not a problem.

 

I doubt there is a problem, but if you aren't going to follow manufacturers recommendations, why do you care? I mean really?

Not trying to be a jerk either. You made a decision, you don't need our affirmation.

 

Pardon, but how am I not following the manufacturer's recommendations, aside from the obvious DIY / non-OEM oil vs dealership job? The manufacturer specifications designates GF-5, however GF-5 does not appear to be widely available anymore, its 6A now. Additionally I could just go straight GF-6A and throw away the GF-5, but if there are no consequences to mixing 5 and 6A, that would be less wasteful and save money.

I do care about proper maintenance, to enough of an extent that I do what I can myself due to shoddy work and higher costs at the dealership. I welcome any critique of what I do or correction to anything on which I may be mistaken. I aim to improve.

 

It is a public forum. You will get all type of opinions. Take the majority of the comments above and rest easy playing tribologist lol.

 

Yep, try not to overthink it.

 

Don't over think it. Next time I do my oil change I've got a quart and a half of shell 0w20 gas truck and a 5 quart of super tech 0w20 that is also now 6A. Guess what I'm going to pour them in together and not loose a second of sleep because of it. All quality oils of the same viscosity are so close that the engine will only know its oil

 

Sorry, my complete miss reading of what you wrote. I'm a dumbass.