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How did you wind up with the extra L ?Best to mix them
How did you wind up with the extra L ?Best to mix them
I don't have oil left over from a single oil change. When I've bought oil in the past I buy several cases at a time. Over 50-100K miles I may have to add oil on occasion therefore it's hard to know exactly how many oil changes I'm going to get out of 5-10 cases of oil. I use straight 30w in my my lawn mowers instead of multi viscosity.If you have left over oil after an OCI, you bought too much. If you have left over oil, put it in you lawn mower.
OK, lets turn that around.That quote you posted literally confirms what I said in that there is no harm in mixing.
double post- please deleteThat quote you posted literally confirms what I said in that there is no harm in mixing.
OK, lets turn that around.
What is the benefit to mixing?
I stand correctedMe: Honey, I need to buy some oil.
Her: Why?
Me: Because I need to change the oil in your car.
Her: Why?
Me: Umm...'cause it's due
Her: But why now?
Me: Because it is.
Her: We don't need to spend money on oil right now.
Me: But you just paid $30 for a bottle of shampoo.
Her: That's different. I needed that.
Alternatively:
Me: Honey, I'm changing the oil in your car. But I don't have to buy any oil because I already have some.
Her: Ok
Me: Honey, I need to buy some oil.
Her: Why?
Me: Because I need to change the oil in your car.
Her: Why?
Me: Umm...'cause it's due
Her: But why now?
Me: Because it is.
Her: We don't need to spend money on oil right now.
Me: But you just paid $30 for a bottle of shampoo.
Her: That's different. I needed that.
Alternatively:
Me: Honey, I'm changing the oil in your car. But I don't have to buy any oil because I already have some.
Her: Ok
Is that the same guy whose next door neighbor's '87 Mustang GT blew up on a Fram OCOD?... just keep in mind it's what I heard from my mechanic's barber's cousin's postman's doctor.
...if oils weren’t compatible with each other and we would surely see disclaimers in owner’s manuals saying not to mix brands...
I would almost interpret that as meaning....don't mix anything other than motor oil in the motor oilFrom the Passat Owners Manual...
VW Digital Owners Manual
api.ownersmanualvw.com
"Do not mix any lubricants or other additives into the engine oil."
LOL I'm amazed it didn't say only change here at the VW Stealership!From the Passat Owners Manual...
VW Digital Owners Manual
api.ownersmanualvw.com
"Do not mix any lubricants or other additives into the engine oil."
Why is it OK if you want to use up old stuff, but not OK to do it with new oil ... ex: mixing 0W-20 with 5W-30 of the same brand and flavor, Castrol EP or Mobil 1 EP? It seems to me that using similarly formulated oils would be the ideal way to go if one wanted to mix. Why not every oil change under such a circumstance? Perhaps not ideal, but maybe most ideal?Mix if you have to just to use up old stuff, but not on purpose on every oil change.
We don’t know what the reference oils are. If we do then I’ve never seen it. They could be specifically blended oils that are designed to cause negative effects when tested with sample oils with incompatible elements.
The OEM’s obviously care if motor oils are compatible with each other. I would imagine that warranty costs would skyrocket if oils weren’t compatible with each other and we would surely see disclaimers in owner’s manuals saying not to mix brands. What we have with the API is a collaborative effort between OEM’s, oil formulators, and oil marketers, and there is clearly a vested interest with all parties involved that all the products don’t cause undue harm to another competitors product.
If you are using the correct oil specification for your engine, using different brands simultaneously should be of no worry. If using a non API rated oil or OTC additives then all bets are off. After being here for 10 years I can’t believe how so many old myths still get circulated.
The latest revision to Lycoming Service Instruction 1014 gives recommendations for lubricating oils, oil change intervals and engine break-in. Pilots and mechanics should know what weight, type and brand of oil is being used in the engine being serviced. At each oil change, this specific information should be recorded in the engine logbook. Except as a temporary measure in an emergency, different oils should not be mixed. Consistent indiscriminate mixing of oils may create high oil-consumption problems or clogged oil control rings and oil screens.