Redline 5-w30 in turbocharged DI engines

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Long time lurker. I have a Mazdaspeed 3 that has seen a steady diet of Pennzoil platinum 5w30 or 5w40 euro most of its life, which I’ve been completely satisfied with. However after selling my Ram 1500 I have a few gallon jugs of Redline 5w30 leftover I’m looking to use. To me it looks just as thick as the Pennzoi 5w40. Is there any reason not to run it in the Mazda? I’ve maintained short OCIs of 3k miles.

Thanks!
 
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Red line has an 800 number call them,
Red Line Synthetic Oil is open for business Monday through Friday, 7:00 a.m. to 3:30 p.m. PST.

Red Line Synthetic Oil

6100 Egret Court Benicia, CA 94510
Phone: (707) 745-6100 or (800) 624-7958
Fax: (707) 745-3214
 
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I would probably email redline and ask. As late as mid 2021 we have VOA with redline 5w30 was 3k+ calcium which is not great for TGDI/LSPI.
 
Red line has an 800 number call them,
Red Line Synthetic Oil is open for business Monday through Friday, 7:00 a.m. to 3:30 p.m. PST.

Red Line Synthetic Oil

6100 Egret Court Benicia, CA 94510
Phone: (707) 745-6100 or (800) 624-7958
Fax: (707) 745-3214
Redline advised they recommend the Euro version of their oils in DI engines, but have had no complaints of LSPI with their standard 5w30.

I’m just going to use it up on the next change and keep an eye on the knock readings.
 
"High oxidation show oils with esters. (if you take fresh oils.)
6-12 - oxidation of oil without esters.
35 - with esters about 5%
60-70 - with esters about 10%
But that's with ExxonMobil's Esterex, other esters may show different oxidation."

There is a guy on the Russian Oil Club site that seems very knowledgeable. This data he posted correlates with what I've seen and from Dave at Redline.

M1 oxidation readings are usually under 10.
M1 0w40 - 36
Amsoil - 40-50
Redline - 90-120
Valvoline Restore which they claim is 50% Ester - 115.

These are not exact figures as the type of ester varies, but you can get some sense of ester %.
 
But then again LSPI is only an issue on forced induction gasoline direct injection yes?
Not so sure. Not all DI FI engines experience it IMO it primarily depends on the programming. It's akin to constantly short shifting an engine (i.e. Low RPM but high load) for max fuel efficiency. I suspect it's possible to occur in any FI engine (DI or PI). We just never saw it with FI PI because at the time these engines were in service the emissions and FE requirements weren't as stringent and turbos were larger so boost came on higher in the rev range.

My IMO of course.
 
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