Thanks guys:
Motorbike,
Yes, I was planning to do some UOAs on any mix I’d create, but only to establish if the oil’s holding up. It's not something I'd do for the life of the vehicle. I don’t change my filters at 5k mi/6 mos, so that’s not part of the plan.
Al,
The savings are long term (5-10 yrs) & for two cars. When you're out of a job, even small savings over long periods of time add up. I haven't seen a trend in any UOAs which show that longer drain intervals create more wear particles. Yes, more particles accumulate over longer intervals, but that's not the same as generating more wear. I also "need" to extend my OCIs out to 10k miles. For my own conscience.
Ted,
Actually, this was a serious question. My reasoning was to make the most of the least. I have no desire to dump oil that still has the ability to do its job. If Amsoil can protect for 25k miles, why would I dump it after only 10k? Neither of these cars are turbocharged (although yes, they're both Saabs), & one cost less than the last bicycle I bought. And I have no place to store my bike, much less a 55 gal drum of oil.
__________
I appreciate the responses. It's made me realize I'm trying to get too little to do too much. It's funny in a way. A year ago I was convinced that "premium" Group IV syn was the only thing I was comfortable running for 10k miles in any of my cars. Then, after spending so much time here & reading the experiences of others, I began to think that other, less expensive oils would do just as good of a job under certain conditions. I guess I'm thinking about it too much, eh?
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