Recent content by JZiggy

Correct. At this OCI I highly doubt the TBN is low yet.

It's a small engine with a big job to do. It's hammer down all the time, but seems happy with its lot in life.

This van now has 190k and still doesn't burn any oil at all. Have been running 5W-40. Finally got around to running a UOA: https://bobistheoilguy.com/forums/threads/uoa-on-2012-sienna-2-7l-1ar-fe-190k.398728/

First UOA on the Sienna, 2.7L engine with 190k. I've been running 5W-40 because it helps with the cam phasor noise on startup. This is the same engine that I did the piston soak more than 30k ago. Doesn't burn a drop anymore. Nice to see that it's wearing normally. Thoughts, ideas, comments...

Family member had a Camry with that 2.4L and got it well above 400K. It finally blew a head gasket, but it was driven around without a working radiator fan for quite some time 😒 Fixed it, but then it immediately got rear-ended 😣 Awesome, reliable engine!

If you look up Timmy the Toolman on YT he has an excellent and fairly exhaustive video series all about 3rd gen 4Runner repair. Great source for some of the basics you'll encounter with a new-to-you vehicle: transmission fluid change, timing belt, radiator replacement, brakes, etc.

I've had a set of thread chasers for 15+ years and refer to it often. No risk of accidentally cross-threading something since they're not nearly as sharp as a tap. Like someone said earlier they are handy for "cleaning" the threads.

Thanks ya'll. I know the engine is wearing well, so definitely not an attempt to overthink it out of worry or fretting -- it's just fun! Blackstone was kind enough to answer an email from me about this topic. Based on our interaction it still seems that optimizing for minimal ppm-per-mile...

Well, I like data and like putting it to use. But it sure sounds like the science is settled and there's nothing to talk about. Is there a better proxy for "wear," or is it a black box?

So in short, despite the 14 data points, there is no way to draw useful conclusions about optimizing oil selection or OCI?

Pablo, can you help me understand what you mean by "it's not wear"? Are the ppm counts of the main wear metals not the best way to determine the amount of wear happening during an OCI? Points taken about measurement error / error bars, and dataset only has n=14. Only so much solid statistics...

Sorry, just have to poke a little when I can. Engineering topics but this isn't work :cool: I had the thought to compare the different variables (oil weight, interval length, etc) vs Total wear PPM / interval miles - Looks like 40wt oils give lower wear - Total wear PPM counts are independent...

Bet you're fun at parties!

For metrics my thought was to minimize ppm/mi for the key components Fe, Al, and Cu

Compression values are good, zero oil consumption