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Wow! and a recommendation to go for 20,000 miles next time. Still had 3.3 of TBN. Prior column of 11,934 miles was on Mobil 1 Extended with Toyota filter. The microgreen filter includes by-pass filter in the regular screw in filter. Claims it filters down to 1 or 2 microns. SSO + Microgreen...

I saw a post on here some time ago that some labs don't actually count particles and sizes but count some particles and then use some formula for extrapolation. So I am looking for a lab to tell me about the actual particle count and size in my used oil to test my filtration and how well my...

I am encouraged and will use Amsoil 0W30 for annual changes (12k to 15k miles) From Blackstone comments: Everything looks good in the first sample from your Prius. You ran this oil almost 12,000 miles and all wear read around averages. Those averages are based on an oil run of ~6,800 miles for...

Someone lost the owner's manual. Anyone know what ATF is specified and if Mobil 1 ATF meets the specs? All 5 previous tranny fluid changes were accomplished by changing out the tranny. Arrrrrgh.

Can it be installed in parallel with the ATF cooling radiator; or must the return go back directly to the sump?

I notice that Mobil and Amsoil advertise their products as good for very long oil change intervals (15,000 to 35,000 miles). Yet I see no one here seems comfortable to go this far--except the son of a Porshe owner that went just under 20,000 on M1. Does anyone go that far? Should I get a...