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Originally Posted by rob76turbo
LB...
When you say cheap oil, what are we talking about? Synth oil is pricey and we are talking about running it 30 minutes max. And I have not seen many "dino" oils that are either 0W-40 or 5W-40. So do think it is okay to run a Penzoil, Quaker State type oil for that short cycle?
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OK... I think a little clarification is in order before I get to your specific question.
I do not advocate flushing the motor as scheduled maintenance or a preventative measure, and I don't want to give the impression that everyone s/b running out and buying motor flush for their cars. Anytime you run solvents through the engine there are risks.
Risks of excess wear, risks of causing leaky seals (because the 'crud' often aids the seals), risks that some of the dislodged deposits would block vital oil passages, etc. And, it is expensive (relatively so with all the oil/filters used etc.).
So, only if the engine needs it - is very high mileage and
tired would I personally flush it.
It is not a cure-all and a well maintained engine with proper, regular oil changes using a quality oil won't usually require it. I mean that's one of the main functions of the oil - to capture combustion byproducts and hold them in suspension til the next oil change, something it actually does pretty well.
To just go and do it on the theory that "
it couldn't hurt" is a false cost/benefit and the money might well yield more benefit if say it were spent on new plugs, or a coolant change.
All that said, to answer your direct question; if your car meet the criteria, and/or you are willing to assume the costs and risks of performing the flush, then I would say that you want a quality interim oil. Afterall, it's still flowing through your precious M96. 30 min. may not seem like a lot of time, but it takes just a fraction of that to starve a bearing or create permanent wear. When added up, this is a fairly costly procedure, no getting around that, and I cannot tell you what oil you should put in your car.
OTOH, you can always take a sample of the interim oil and run it through a coffee filter to see how much gunk is in it, and if satisfied, always reuse the interim oil in a less cherished (and possibly more robust) daily driver, your lawn mower (probably a lifetime supply given the quantity), etc.
