Glad to hear your M96 is running well on the 15W-50! Now let's hope that vario-cam code stays off
I'm actually considering using 15W-50 in my drift car. For how often the oil needs to be changed (E85), it's probably worth it over the Royal Purple.
So far, so good. I cannot emphasize enough how much more smoothly the engine runs. Curiously, and this may be placebo effect, but part throttle response below 4k rpm feels stronger. And the difference does not seem subtle. Even more curiously, oil and coolant temps are down 3 and 4 degrees C, respectively. Same ambient temp...same roads....same driving style. In fact, I am fairly certain I was hitting it harder on the 15w-50 runs than when Edge 0w-40 was in there. Multiple outings now.
We'll see if the trend holds. But, for Florida summer use (thermometer says 97 degrees right now, though area temps are supposedly lower), I'm not sure there's a better oil for anywhere near the price of this stuff.
Delo 40 LE Full syn 5w-40 will go in next OCI for the colder(ish) months. In FL, morning temps can dip into the 30's for a few weeks during "winter". But it never got below 80 degrees at my house last night.... even just before sunrise.
I've used M115w-50 (and the occasional M1 5w-50) for years in our 996 and have never had a problem. I made the same observations as you on the noise and oil pressure on the 15W; the engine is noticeably quieter on startup as opposed to with the 5w. I am currently using the M1 5W-50 in the Boxster S.
Both vehicles' manuals allow synthetic 15W-50 for 'mostly above 50dg' or some similar language, so I cannot see any problem w/ that weight in mild weather.
Nice car, enjoy.
Excellent info and our experiences seem to correlate and corroborate. Did you find that the engine had any more difficulty in revving (say, during down shifts)? I am quite sensitive to that and I have not detected a difference when heel-toeing.
If the 5w-50 were available for $22 in a 5 quart jug, I definitely would have started with that first. But, the 15w-50 was the logical first trial. I'm HUGE on letting the car get up to temp (including the oil, which trails coolant temp until about 90 degrees C on my car) before any
hooning occurs. I'm just adamant about it...in every car I drive. The issues that others may have reported seem, at this point, to be related to the injudicious application of the loud pedal before proper warm up has occurred.
I should reiterate that I have upgraded the awful factory oil filter element with an LN Engineering screw-on oil filter adapter that permits the use of the same screw-on Fram Ultra 3675 that the LS V8 motors use. It lacks a bypass valve (everything I can find with this thread pattern and base plate diameter does), but does have an ADBV. This can only help the situation.
The OEM or equivalent filters are only supplied by Mann, Hengst, Bosch, and a few others....and I haven't been able to find any reliable data on filtration efficiency for any of them. Fram Ultras have been stated to be 80% down to 5 microns (Motorking, here on BITOG).
I have read of (and seen photos of) nearly new OEM paper cartridges getting crushed when using 15w-50. In fact, that was the only concrete argument I have seen against the use of M1 15w-50. Considering my experiences so far, and the use of a screw-on Fram Ultra, I just don't see this being an issue.