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Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? #5129596 06/09/19 06:02 PM
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Dwight_Frye Offline OP
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I want to drain the factory fill and change the filter on my new Mazda CX 5 with the 2.5 liter Turbo Skyactiv engine somewhere around the 1000 - 1200 mile mark and refill with a quality synthetic.
I think the Castrol Edge will be a good match for this engine. I have 3 quarts of Redline 5W-30 leftover from my supply for my previous Nissan 370Z that I would like to consume.

Any issues with mixing 3 quarts of the Redline and 2 of the Castrol Edge of the same viscosity and running until the next change and then refilling with Castrol Edge for the regular OCI's ? The dealer offered me a free oil & filter change at 7500 miles but I don't want to run that long on the factory fill and who knows what kind of bulk 5W-30 they will use for the free change.

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129620 06/09/19 06:16 PM
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nascarnation Offline
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If you were in the Great Lakes region I'd say skip the oil change because Mazdas rust out long before the engine fails
But in California, perhaps a different story.

Last edited by nascarnation; 06/09/19 06:16 PM.
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129640 06/09/19 06:40 PM
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buster Offline
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It's not ideal but can be done. I would only do it the one time.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129647 06/09/19 06:52 PM
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dave1251 Online Happy
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It can be done. I don't see any advantages but nothing bad will happen.


make the inside of your engine oil cap white.
don't use.
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129693 06/09/19 07:35 PM
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Brojo Offline
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“What are you running?”

Red Edge 5w30

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Brojo] #5129722 06/09/19 08:03 PM
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John_K Offline
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Originally Posted by Brojo
“What are you running?”

Red Edge 5w30



I like Edgeline.


2009 Mercury Grand Marquis, 8 cyl auto, 93xxx miles, PU/Fram Ultra
2005 Hyundai Sonata, 4 cyl auto, 99xxx miles, Maxlife/OEM Filter
Current oil stash: 459 qts.


Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129802 06/09/19 09:20 PM
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Mainia Offline
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Wait till you get more miles on it, then do it...like 5,000 more.

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129810 06/09/19 09:33 PM
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double vanos Offline
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A Frankenbrew in a brand new car. One of the many reasons I like hanging out here. LOL


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129820 06/09/19 09:41 PM
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Nickdfresh Offline
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You bought a new car, but are so cheap you won't bother to get matching oils? Really?

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129854 06/09/19 11:28 PM
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Marco620 Offline
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Wait a MINIMUM of 2000 miles or first oci before as to make sure break in is complete. Think on back of bottles they say to wait.


15' Civic 1.8 i-vtec 293500 mi Redline 0w20 & LG Biotech, BP CVT Fluid,Redline Si-1
Doberman Whisperer!
Doberman,CZ's & SONY Aficionado

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: double vanos] #5129880 06/10/19 01:38 AM
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Originally Posted by double vanos
A Frankenbrew in a brand new car. One of the many reasons I like hanging out here. LOL


👍😂

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5129965 06/10/19 05:58 AM
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sloinker Online Shocked
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Castroline, formulated in Cuba for the motoring enthusiast!


'16 Tiguan TSI Ravenol VST 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5130001 06/10/19 07:04 AM
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SureshR Offline
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5w30 ACEA A5/B5 is what Fords ask for. If your Redline is a 5w30 A5/B5 it shouldn't matter all that much. Though draining a factory fill oil at 2000 miles .. well, I am sure the oil companies need to stay profitable.


2014 Ford Fiesta 1.5 TDCI (Mobil F1 5w30 A5/B5 Ford WSS-M2C-913D) | 2015 Mahindra Scorpio 2.2 mHawk (Amsoil CK4 Turbo Truck)
Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5130049 06/10/19 08:15 AM
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gman2304 Offline
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Buy 2 qts of Redline of the same flavor, change the oil, then you’ll have all Redline in the sump and not feel conflicted. Next oci go with the Castrol. Or ship the Redline to me....prepaid, and go with the Castrol at the first oci. Simple really. wink

Re: Any Issues Mixing Redline 5W-30 and Castrol Edge 5W-30 ? [Re: Dwight_Frye] #5130060 06/10/19 08:23 AM
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Triple_Se7en Offline
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Originally Posted by Dwight_Frye
I want to drain the factory fill and change the filter on my new Mazda CX 5 with the 2.5 liter Turbo Skyactiv engine somewhere around the 1000 - 1200 mile mark and refill with a quality synthetic.
I think the Castrol Edge will be a good match for this engine. I have 3 quarts of Redline 5W-30 leftover from my supply for my previous Nissan 370Z that I would like to consume.



Use one quart of Red Line for each of the next three OCIs. Overstock problem now solved and the new Mazda gets mostly-all correctly spec'd oil each OCI.


19' Hyundai Santa Fe 2.4 GDI - Valv Syn 5w30 / Napa Proselect filter / 6oz Liqui-Moly
20' Kia Soul X-Line 2.0 Multi-port / Factory-fill oil / filter
04' Colorado 3.5 / Castrol Edge 0W40 / K&N filter
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