can you mix oil?
02-23-2013, 12:56 PM
#3
1st Gear Member
Join Date: Feb 2012
Location: Alberta
Posts: 61
just dont mix synthetics with mineral oils...
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
02-23-2013, 05:52 PM
#4
2nd Gear Member
Join Date: Sep 2009
Location: Jax FL
Posts: 442
just dont mix synthetics with mineral oils...
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
02-23-2013, 11:35 PM
#6
Banned
Join Date: Feb 2013
Location: USA
Posts: 545
There is absolutely no problem whatsoever mixing different weights of synthetic, dino, semi-synthetic, Groups II, III, IV and even V oils.
None. Zero. You can even find online calculators to determine the final mix: 6.5W 22.7, or whatever.
If there was a problem, you could never switch from dino to semi synthetic to synthetic as you can never drain all the old oil out of your engine.
As an aside, there has been much discussion about 5w-20 vs. 5w-30 in 4.6 modular engines. I've personally spoken with former Ford engineers who have verified that Ford switched to 5W-20 solely to gain a few tenths of a gallon MPG in CAFE testing. The engineers, along with ex-Ford Mustang Bullitt-Mach 1 Program Manager Scott Hoag all agreed that 5w-30 is preferable particularly for 4v engines. The engineers went further to state 10w-30 or even higher weights are better for track driven modulars.
None. Zero. You can even find online calculators to determine the final mix: 6.5W 22.7, or whatever.
If there was a problem, you could never switch from dino to semi synthetic to synthetic as you can never drain all the old oil out of your engine.
As an aside, there has been much discussion about 5w-20 vs. 5w-30 in 4.6 modular engines. I've personally spoken with former Ford engineers who have verified that Ford switched to 5W-20 solely to gain a few tenths of a gallon MPG in CAFE testing. The engineers, along with ex-Ford Mustang Bullitt-Mach 1 Program Manager Scott Hoag all agreed that 5w-30 is preferable particularly for 4v engines. The engineers went further to state 10w-30 or even higher weights are better for track driven modulars.
02-23-2013, 11:39 PM
#7
Banned
Join Date: Feb 2013
Location: USA
Posts: 545
just dont mix synthetics with mineral oils...
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
Im pretty sure the SAE designed them so they would mix, but in the industry there are many different types of oils with different properties and additives. And a lot of them cannot be mixed. I have seen first hand what can happen when you mix a synthetic oil with mineral oil in a compressor. the oil worked great while the machine was running but as soon as it was shut down and allowed to cool the oil turned into a hardened silicone type viscosity.... needless to say the compressor needed to be completely overhauled and cleaned because it wouldn't turn over anymore.. (and the customer decided not to service his own compressor anymore lol)
I personally wont do it, but like I said before SAE probably made the additives all get along so it shouldent be an issue when buying oil for a car.
This must be how old wives' tales start. I'll make sure I take your advice the next time I put 5 quarts of synthetic compressor oil into my 32V DOHC crankcase and reach for a quart of mineral compressor oil to bring it up to 6.
Thread
Thread Starter
Forum
Replies
Last Post
jwog666
Pipes, Boost & Juice
11
12-27-2021 08:09 PM