Originally Posted by demarpaint
Originally Posted by MNgopher
Originally Posted by demarpaint
We're all entitled to our opinion.
When Ford back spec'd some of their engines from a 20 grade to a 30 grade oil to reduce warranty claims, or electronically castrates them when things get a little out of hand for the 20 grade oils that tells me something. But we've beaten that horse to death here. Bottom line, run what you think is best for your application.
Curious which applications electronically castrate the engine due to engine oils? Got a specific?
Here ya go, this is one of many:
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3384902/1 He uses cripple and castrate as terms for the ECM cutting power to engines spec'd for 20 grade oils in the thread.
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And using your Ford example, does Ford recommend anything heavier than the spec' 5W-20 for the Mustang GT even for track use regardless of how high the oil temp's get? Again the answer is no.
No, instead they cripple the engine if the oil temps get too high. So instead of giving people options, they castrate the engine. Again, that does nothing to prove your point. In fact rather, it works to prove MINE.
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From an engineering view point there is more than one way to deal with high oil temp's than running heavier oil. In fact that's very much the last thing you want do with all the negatives associated with running heavier oil grades when you are not seeing high oil temp's.
Then why do companies do it? Give me some REAL REASONS why Ferrari, with their expertise, Ford, with theirs, Porsche, with theirs, BMW, with theirs, Mercedes, with theirs, GM, with theirs....etc Continue to recommend heavy oils when they apparently have a myriad of ways of otherwise dealing with the issue? I mean, they leverage factory thermostatically controlled oil coolers, huge sumps....etc, yes STILL require heavier oils. So do you know something the engineers from these companies don't? I mean you DID mention "from an engineering standpoint" which would mean that you've worked at engineering lubrication systems for high power density engines for an OEM and have intimate knowledge of the design process in order to make such statements, correct?
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My advise to anyone with a late model car, is to take full advantage of all the safety management systems that have been engineered into your car and run the lightest oil specified.
There is no lubrication benefit in using anything heavier.
That's a cop-out. Ford REQUIRES 5w-50 or 5w-20 for the Mustang GT depending on whether you have the track pack or not. By your own admission OEM's don't spec a variety of oils anymore in most cases. Running the lightest oil specified in a BMW that spec's 10w-60 leaves you with.... 10w-60! This is like telling people there's no reason to run 10w-60 in a Veyron that spec's it and then telling them to run what the manual says.... WHICH IS 10w-friggin-60!
Are you honestly arguing that somebody is better served running their base GT, which does NOT have a factory oil cooler, on 5w-20 at the track and just assuming that their engine going thermal and cutting power is a better approach than Ford's own technique of modifying or deleting that safety mechanism and running a heavier lubricant in conjunction with an oil cooler? That sounds a bit ridiculous to me. It sounds like the base GT is geared for people whose vehicles will never see a racetrack. And if, by chance, they do, there are safeties in place to prevent the engine oil from getting too hot and unable to provide adequate protection under those circumstances, and so the engine cuts power so that it doesn't spin a rod bearing or 8.
Guys planning on tracking them, Ford is betting, will opt for the Track Pack version, which comes with a big 'ol honkin' oil cooler and spec's 5w-50. So they can go hog wild and not worry about tossing some bi-metal shells into the pan
If your only argument here was that a heavier lubricant is not optimal much of the time, I'd agree with you. But positing that there is no reason to run a heavier lubricant, which was your initial statement, is ridiculous. If that was the case, OEM's wouldn't do it. But they DO do it, and I'd bet that the OEM's know more about engine design than either of us, which means that one of us is wrong, and since I'm the one siding with the OEM, my money is on that person being you.
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You doing nothing for your blanket statement other than if you track your car you should use a thicker grade. If a F-1 car only get up to highway speeds a 16 grade will provide the nessary thickness for protection. You are making all this noise and what is the highest oil temp your vehicle will see?
