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another 40wt UOA. this car spent a lot of time sitting at about 80mph for hours this go around (3600 RPM), so oil use is up a bit, but K20's are known for that. AL is up a little but i don't think its much to be concerned about, but its nice to see no PB. sees the 8,200 RPM limiter nearly every...

cut down the interval a bit on this run due to a lot more towing than usual for us - 1700 miles over 4 days pulling a small camper, fully loaded, with the engine locked out of overdrive. Toyota recommends a 5,000 mi OCI for severe use, I figured I wouldn't stray too far from there. lots of mixed...

Figured some might be interested to see this since 4R's are specced for 0W-20 in the US but heavier weights in other markets. Very pleased with the low iron (big timing chain) and silicon looks like its still coming down. Not too worried about the flashpoint since M1 0W-40 is on the thin side...

In my effort to try out different big-name 0W-40's in my K20z3 engine, this was my first run of Castrol. I would have liked to fed it more mileage but by the time I drained it the oil had 15 months of service on it and I prefer to stick to 12 months if I can help it. Make-up oil was Mobil1...

here's my 2nd run on good old M1 0W40 in the high revving Si. like most of you it was an odd year for driving, the car sat quite a lot from Jan-April but when it was taken out, it was run harder than usual (part to blow the cobwebs out, part to keep me sane). even though miles are low (and...

This is my first report on this vehicle. Nothing too surprising here but the goal was to start a baseline for future analysis once the worst of the break-in metals flushed out, so I can dial in the oil change intervals for our vehicle use. I bagged two 5qt jugs of the QSUD last year on sale at...

this analysis comes after almost exactly 1 year of service. i grabbed a 5qt jug of this oil on a great sale and decided to give it a shot after a promising result from Mobil1 0W-40 the time before. the onboard oil change minder typically calls it quits around 6,000 miles, but i decided to run it...

I bought this Si used on Labor Day 2017, and this run of 0W-40 is the first change of oil I've personally put through it. I chose to stick with the recommended interval of the onboard maintenance minder as a baseline for my first analysis. The car's driveline is entirely stock, but I did replace...

nothing amazing to report here, given most non-turbo subaru UOA's. makeup oil was not insignificant at about 1.5 quarts, but that is about the normal usage for this engine for years now. oil filter used was an OEM "blue" filter. oil was run just short of a year. this car is mostly stock...

This a followup UOA from a previous one that indicating high potassium and sodium - possible head gasket leak. I was hoping it was a freak reading but it appears potassium is still present and sodium is as high as last time. I'm not sure what to make of it...potassium is trending down but sodium...

hi guys, looking for some advice here. our xterra has always been treated to relatively short synthetic OCI's due to the small oil sump capacity, usually in the range of 4000 miles per change. this past summer was unusually hectic for us with a move to another state and all the driving around...

Long time lurker, first time poster. So, Hi everyone! I had the head gaskets replaced at 88k miles earlier this year due to seeing some seepage between the head and block and wanting to nip it in the bud. Unfortunately a bit of an achilles heel with this engine. This analysis was primarily to...