[Formulajones]

My question would be how harmful are those start ups for the engine with old oil sitting for long periods. I'd like to see an OA before and after to see just how corrosive it might be.

I don't know, that whole "leave the oil in" for years just because it doesn't have mileage on it doesn't sound like a super idea to me. Not something I'd do with my very expensive engines. OA's would tell the story.

It's interesting stuff, I'm just not willing to do it with my stuff but I'd entertain someone else that wants to subject there engines to that sort of testing

[78w72]

Originally Posted by Formulajones

My question would be how harmful are those start ups for the engine with old oil sitting for long periods. I'd like to see an OA before and after to see just how corrosive it might be.

I don't know, that whole "leave the oil in" for years just because it doesn't have mileage on it doesn't sound like a super idea to me. Not something I'd do with my very expensive engines. OA's would tell the story.

It's interesting stuff, I'm just not willing to do it with my stuff but I'd entertain someone else that wants to subject there engines to that sort of testing

I guess I see it different... why/how does 1 year old oil with very low miles just all of a sudden "go bad"? & if it did go bad, when does that happen, was it good at 11 months but some arbitrary date of 12 months magically makes it bad?

Have never seen any tests or proof to support that and based on my experience thats not reality. Ive seen lots of UOA's that show oils of different brands over 1 year old, even at much higher miles than we are discussing here, are still perfectly healthy.

[Formulajones]

Corrosion would be the one big concern. As mentioned conventional oils have still shown corrosion problems from sitting which is likely why some boutique oils felt they needed a formulated oil just for that purpose.

As to your other question, when and how long, that's what the OA's are for, great for determining things like that as well as change intervals, filter effectiveness and whether the oil is doing what it's supposed to be doing, which is why I mentioned I'm interested in seeing the different results. It's really the only concrete way to answer those types of questions.