Is it typical bad to do this? I’m doing this on my 24 Tundra. Currently running Mobil 1 Extended Performance and MOA for 5K intervals. I’m having the dealer do the 10K with I’m just assuming bulk oil. I prepaid for maintenance up to 85K but don’t want to wait 10K to have the oil changed. Plus this give me a chance to look things over. Thanks.
Switching back and forth between oils
- Thread starter ARB1977
- Start date
Patman
Staff member
The main problem would be if you were doing longer intervals (10k plus) as those higher intervals would be safer if you didn’t have different chemistries in there that might potentially compete against each other in a way that would result in accelerated oxidation or faster TBN depletion
I'm retentive, so I could never do it. I'm planning out a potential switch from AMSOIL Signature Series to HPL Premium Plus PCMO, but because I have a case of Amsoil on the shelf, not for another two OCIs. I just changed the oil the other day, so with our usual annual mileage, it will be toward the end of next year, or maybe into 2027, before I'd make the switch. I've already researched HPL's recommendations on shelf life of their oils as well as the shelf life of Amsoil's EA15K13 filters (five years per their tech support line 
). Looking forward to HPL's 4th-of-July sale to see if I'm going to buy and switch.
I wish my brain was wired to not worry about little stuff like type of oil in my engine, as long as it meets manufacturer's spec and is changed regularly.
). Looking forward to HPL's 4th-of-July sale to see if I'm going to buy and switch.I wish my brain was wired to not worry about little stuff like type of oil in my engine, as long as it meets manufacturer's spec and is changed regularly.
It’s fine.
There is no guarantee the oil will stay the same using the same dealership. They could be supplier swapping and you’d never know it.
There is no guarantee the oil will stay the same using the same dealership. They could be supplier swapping and you’d never know it.
There's a thread talking about when Amsoil is going to refresh their Signature Series line, specifically 0w-20. If and when this happens, do they keep the current and offer the new? Or just change the formulation and not say anything because they know changing to the new isn't relevant?
Coke? New Coke? Classic Coke? They shouldn't have came out with the New Coke marketing campaigns. Unless someone other than Coke had been doing Virgin Coke Analysis (VCA) on a consistent basis, the world would never have known, and Coke could have said "Hmmm, that's odd. We'll look into it".
I don't want to think about UCAs.
Coke? New Coke? Classic Coke? They shouldn't have came out with the New Coke marketing campaigns. Unless someone other than Coke had been doing Virgin Coke Analysis (VCA) on a consistent basis, the world would never have known, and Coke could have said "Hmmm, that's odd. We'll look into it".
I don't want to think about UCAs.
There is a risk of additive clash between oils of differing chemistry. This is a small risk, unlikely to occur and unlikely to cause a significant issue (relative to engine life) if it does, but a risk nonetheless. Any harm from frequently switching brands is unlikely, but it is always optimum to continue using the same brand.
Once upon a time…..it’s mostly people latching on to things with a little truth behind them and letting their imaginations run wild.
If you want to go out of your way and mix a high zinc and a high calcium oil together, you could manufacture problems.
There’s a certain cognitive dissonance in all this. If you’re willing to put third party additives in your oil, how legitimate is the concern about third party additives from residual oil?
If you want to go out of your way and mix a high zinc and a high calcium oil together, you could manufacture problems.
There’s a certain cognitive dissonance in all this. If you’re willing to put third party additives in your oil, how legitimate is the concern about third party additives from residual oil?
It's fine I have swapped for 30plus years back and forth between whatever I have bought or in my stash of oils. The trace amount left behind is not going to hurt anything.
Why mess up a perfectly fine oil with an additive?
I completely read over the part about MOA. There's nothing in that supplement that will improve M1. It's just making your wallet lighter. Ditch it.
It’ll be gone. I’m thinking on going back to AMSOIL Signature Series.
Other than some folks here , who says this is true ? Any documented tests ?
I have been operating under the presumption that using only exactly one oil...brand, formula, grade, has cumulative positive benefits.