quote:
Originally posted by TooSlick:
Ken,
The four things I've seen with the V-6 are:
1) significant thinning of the oil when tested @ 100C - on the order of 15%-20%
2) rapid TBN depletion - ie TBN's in the 6-8 range in 7500 miles with Amsoil
3) greatly accelerated nitration - 50%-60% in 7500 miles with Amsoil
2) somewhat accelerated oxidation - 20%-30% in 7500 miles with Amsoil
Wear rates look normal, provided you don't overextend the particular formulation you are using.
This engine is simply bad news from the standpoint of oil degradation ...
TooSlick
Dixie Synthetics
I have a 2002 1MZ-FE in my Toyota and have been trying to figure out why the oil reports always come back with the oil flaged as too thin.
I've noticed the results seem to show the TBN and Viscosity aren't what you'd hope for. My results are:
code:
5W-30 'Dealer' Bulk oil
Date: 08-12-02 08-26-02 12-08-02 12-12-02 12-20-02
Engine Miles: 1,528 1,723 2,772 - 2,862
Oil Miles: 1,528 195 1,244 0 72
Visc. (cSt) 8.46 8.94 7.90 10.77 8.58
TBN 3.06 6.23 1.99 7.59 6.18
Oxidation (Max 30) 3 4 15 6
NitrationMax 30) 6 6 13
Silicon: 264 64 62 3 17
Boron: 21 121 81 9 27
Molybdenum: 45 68 55 4 15
In two cases, supposedly 'young' oil only 195 and 72 miles old is much thinner than I would have expected.
The results always showed Fuel dilution
I threw in some additive/silicon numbers as it seems to show that the dealers bulk oil is different between the last two batches I got. And that the oil appears to have actually been changed.
The car currently gets frequent short trips of about 5 minutes, as I live close to work. But, the engine temp. gauge usually shows the car is almost at normal temp when I get to work. In the summer it usually did reach normal temp.
The 12-12-02 0 mile result is supposed to be what they filled it with in a change right after the 12-08-02 sample was taken. So the 72 mile results are supposed to be the same oil, only used a week or so.
The 1,723 and 2,772 engine mile results are supposed to be from the same change period. The Oil was changed right after 2,772 miles, but not after the 1,723 engine mile/ 195 oil mile sample.