Mixing Synthetic Oils - Problem?

[cbrose]

Hi:

I have a couple quarts of Mobil 1 and a few quarts of Pennzoil Platinum, both 5w20 weight. Is there a problem if I mix these two for my next oil change? I did a search on the forum and wasn't able to find a definitive answer.

Thanks,

cbrose

 

[mechtech2]

The rating on the bottle ensures that they are compatible, and can be mixed.
Go ahead.
Some will say that it disrupts the additive balance, but it may improve it.

 

[cmhj]

I've done it during short OCI periods. Good or bad??????????

.

 

[Merkava_4]

Those oils will mix with each other just fine; just don't try to mix them with that canola oil based RLI oil.

 

[aquariuscsm]

Ya,I have a lil bit of Royal Purple in my Mobil 1 15W50. Like Merkava said,DO NOT mix Wesson with Pam.

 

[Triple_Se7en]

I would hold it to a 6K OCI. Conventional oils of different brands are supposedly better to mix than synthetics. I wish I saved the data that shows the reasons why. Sorry!