romus

Someone ask that question to the guy that’s doing the Synthetic Oil study. If you go on the link “Synthetic Oil Life Study” and look in the FEEDBACK you will see what has been asked and answered.

From Wayne Pandorf on 16 June 2003:
while this study is interesting and you are the only guys around who
have attempted something like this, it seems that at the average rate
that you are adding new oil (about 1 quart per 2,400 miles) you may
never need to change the oil out. Essentially you have done one complete
oil change/exchange since you started the M1. the study should be
qualified since the results for a non oil burning engine may be
significantly different. just my 2 cents


Well, that's not entirely true. Up until the 12,000-mile mark, we only used 3.5 quarts of oil, which is just a tick over half capacity. Of course that is skewing the results somewhat, but all oils in the study will be subject to the same bias, so comparatively they will be valid. Also, it's worth noting that only 1 to 1.5 quarts of oil is actually from engine consumption; the remainder is from the sampling. When the test is complete we will provide some calculations to get an idea of how it might have held up if we hadn't been sampling along the way.

kaneman23

I don't like the idea of the extended intervals in either of my trucks(Tacoma & 4Runner) because of Toyota's sludging problems. I know that the 3.4 and the 4.7 aren't the "sludge motors" but any motor can do it. Toyota's just seem more prone. I'm more comfortable at the 3000mi on Dino or 5K-7Kmi on the Mobil 1.