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TBN is a measurement of the reserve akalinity in the oil. Different oils have different retention rates and a single data point does not provide much information except for that particular case. In this example, the oil with the lower number may stabilize for a period of time, while the one...

Who should be believe? RL makes it so I'd think they'd know. The difference between Dyson and Blackstone % wise if pretty high. That makes understanding UOA and VOA a little tough, at least for me. *** *** *** It means that worry over a few PPM of wear is just plain dilettante silly.

My 98 Sienna trans still operates perfectly with 219K on it. Always did a the fluid at 10-15K and have had a couple of flushes. Ever since the factory fill have used Redline D4.

10K MAXIMUM with a top grade synthetic on this engine if it's in good condition. My Sienna with 215K (same engine) has been getting 7.5 - 10K intervals with Redline and GC and no problems whatsoever. I would do an analysis with TBN at 7.5K and see how much reserve TBN you have under your...

I used to have '73 Peugoet 504. It had scissors jack and the vehicle had a provision for jacking the car at the front. One time, when in a hurry and needing to jack it up for brake work or something, the threaded shaft wasn't aligned properly and it poked through the oil pan as I raised the...

Originally Posted By: ravenchris Blackstone and the other labs successfully maintain a high anxiety level among their customers. Posters here do the same thing. I generally ignore UOA posts that are less than 5K stated in the headers.

Originally Posted By: bruce381 ""UOAs."" I don't need no stinking UOA's LOL. I make my own PCMO's but do Run RL off and on I get it (free) and all I can say is years ago I COOKED my Bronco (blown) rad hose in Fresno in the summer 100F+ ran it dry looking for a gas station for water. Had RL...

You obviously have a fuel dilution issue. Check emission system, plugs and air the filter along with its connections. (your silicon is high too) The viscosity decrease is not likely shearing, but due to the fuel. The lead is high - you should never have double digits of lead with this motor...

Now that makes sense for a lot of the inane and inconsistent stuff they write.

>Kinda bored with this oil. Changing to the new M1 10w40 >("High Mileage"), for something new. That's kind of a silly reason for changing, as it's doing a good job and for less money than what you say you will be buying. You're actually putting more stress on the system by going to something...

RL 5W-30 is already a 40 weight in terms of HTHS. You don't need a heavier oil. If you just keep changing oils all the time you'll never find out how each is really doing.

Is there a concrete example of a trend that shows LC doing much of anything? Does it actually thin out oil due to 'anti-oxidation' properties, or is it just because of adding a 10W base oil to the system?

When there are deposits of that magnitude, there is no substitute for cleaning it manually. Period.

All the 5K service intervals and analysis around here with high quality synths are just as bad as the 3K fanatics. Maybe even worse.

THe RL 5W-20 is hardly a 20 weight. The static viscosity is under 30 and the HTHS is higher than some 30W synthetics. Go for it!

10K or even greater service intervals on petrolum based lubricants are the norm ouside the US. For identical engines in many cases. US fuels have more sulphur in them, but that doesn't explain it all, as the basis for the shorter service interval in the US seems to primarily cultural, not...

Egad. Nope. Outa here... ;-)

Oops, I meant older engine.