I'm sure this has been pointed out many times before, and I've thought of it before - but it just dawned on me anew -
There's all these cautionary statements about voiding the warranty if OEM OCI guidelines are not followed. And many folks do all their oil chges at the dealer during the warranty period to insure their insurance. Well, note, you can do any OCI you want and your warranty is still FULLY in place for everything except engine failure due to oil failure. So then I'd ask myself - "I've got a top shelf synthetic in there, I'm keeping it topped off, watching the dipstick for anything weird, and I'm taking it to (eg) 10k - what are the chances of me sludging".
I'd rather spend $20 on a Blackstone UOA at each OC (which would also give a nice written record) to chk for coolant leaks, etc, than - drive to the dealership, sit at the dealership and wait, pay a premium for the oil change in which I'll likely get a mid-shelf oil, drive home." (Probably easier said than done - if I just spent serious bucks on a brand new vehicle, I might be at the dealer too.)
If I remember correctly - when all the dust settled on the Toyota 1MZ-FE sludge issue - you only had to show proof of one OC per year (even though the manual stated 6mo 7.5k)
Bottom line - you can any OCI you want, and EVERYTHING on your warranty is just fine except oil failure issues. I know this is obvious, but it goes to the back of my brain sometimes.
There's all these cautionary statements about voiding the warranty if OEM OCI guidelines are not followed. And many folks do all their oil chges at the dealer during the warranty period to insure their insurance. Well, note, you can do any OCI you want and your warranty is still FULLY in place for everything except engine failure due to oil failure. So then I'd ask myself - "I've got a top shelf synthetic in there, I'm keeping it topped off, watching the dipstick for anything weird, and I'm taking it to (eg) 10k - what are the chances of me sludging".
I'd rather spend $20 on a Blackstone UOA at each OC (which would also give a nice written record) to chk for coolant leaks, etc, than - drive to the dealership, sit at the dealership and wait, pay a premium for the oil change in which I'll likely get a mid-shelf oil, drive home." (Probably easier said than done - if I just spent serious bucks on a brand new vehicle, I might be at the dealer too.)
If I remember correctly - when all the dust settled on the Toyota 1MZ-FE sludge issue - you only had to show proof of one OC per year (even though the manual stated 6mo 7.5k)
Bottom line - you can any OCI you want, and EVERYTHING on your warranty is just fine except oil failure issues. I know this is obvious, but it goes to the back of my brain sometimes.