After reading Cheetahdriver's previous UOA on his 2000 Tundra, I thought I'd post 2 more UOA's for comparison.
Vehicle: 2000 Toyota Tundra 4X4 SR5
Engine: 2UZ-FE 4.7L V-8
Air filter: Toyota
Oil filter: Purolator Pure One
Current mileage: 119K
The most recent UOA was done at 115K miles using 10W30 Valvoline MaxLife synthetic with a 5K OCI. The previous UOA was done at 99K using 5W30 ML synthetic. Here are the results:
/10W30 115K 66.2/5W30 99K 63.9
Flashpoint/10W30 115K 380F/5W30 99K 385F
Fuel%/10W30 115K <0.5/5W30 99K <0.5
Insolubles/115K 0.2/99K 0.6
Comments from Balckstone at 99K:
JACK: Lead read uncharacteristically high in this sample from your engine, so we had the sample
rerun. Unfortunately, it is still there. Lead is from bearings and 2-ppm of this metal would be about
right for this sample. Insolubles were on the high side as well. The TBN was 4.0, so the 5,080 miles
you put on this oil were not too many. In fact, our average oil sample from this type engine has 5,675
miles on it. We found no gas, moisture or anti-freeze in the oil. We will write this lead reading off to a
particle streak. Maybe it will drop to normal next sample.
Comments at 115K:
JACK: It has been a year since we have seen a sample from this engine. The switch to a 10W/30
seems to have helped lead but it still reads three times higher than universal averages. Those averages
are based on a 5900-mile oil run, so your wear rate ppm/hr is also high. All other wear metals look
good. No contamination was found. Low silicon and insolubles indicate good air and oil filtration.
Viscosity was a bit higher than normal for the 10W/30 but didn't hurt anything. We suggest a couple of
shorter oil change intervals to clean up excess lead and check back.
Obviously I'm concerned about the high lead readings. It may be a common theme for the 2UZ-FE engine at higher mileage though, so I thought I would add it to the library for future BITOGer searches. BTW, I'm getting ready to try PP 5W30 in this vehicle on the next drain and fill. Thoughts?