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Castrol GTX synblend 5w-20 in a Mazda5 2.5? #4495707
08/22/17 10:09 PM
08/22/17 10:09 PM
Joined: Aug 2012
Posts: 2,182
Oregon
MrQuackers Offline OP
MrQuackers  Offline OP
Joined: Aug 2012
Posts: 2,182
Oregon
The manual only suggests 0w-20 for USA. Vehicle is well beyond warranty concerns.


Master the 1000 yard stare

coffeeMobil 1 USA
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4495732
08/22/17 11:00 PM
08/22/17 11:00 PM
Joined: Nov 2011
Posts: 4,970
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,970
MTL, CANADA
I dont see why it wouldnt work fine.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4495805
08/23/17 04:38 AM
08/23/17 04:38 AM
Joined: Jul 2012
Posts: 2,568
South Carolina
alarmguy Offline
alarmguy  Offline
Joined: Jul 2012
Posts: 2,568
South Carolina
0/20 is for gas mileage in the USA, many mazdas outside USA say 5/30 is ok which is higher then the 5/20 your asking about.

Not that it matters or means anything.
I never used 0/20 in our 2012 Skyactive Mazda because of the above. Also the direct injection engine is known to dump a bit of fuel into the oil and thins it out. (not that it means anything as well)

Once or twice I used 5/20 (and I truly mean once or twice) but last couple years only use 5/30 We live in hot climate. Your good to go with your 5/20. No engine, not just Mazda would care if it was 0/20 or 5/20 or 5/30. Ok, wouldnt hurt if in sub zero weather to use a 0/20 or 5/20 ...

Last edited by alarmguy; 08/23/17 04:42 AM.

14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4495859
08/23/17 06:21 AM
08/23/17 06:21 AM
Joined: Jul 2015
Posts: 4,655
Down Under
SR5 Offline
SR5  Offline
Joined: Jul 2015
Posts: 4,655
Down Under
I'm sure you will be fine on 5W20 or even 5W30.


---------------------------------------------------------------------------------
Castrol GTX Ultraclean 15W40 A3/B3 + Wesfil-Cooper Z154
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496019
08/23/17 09:33 AM
08/23/17 09:33 AM
Joined: Apr 2013
Posts: 181
Kevil,Ky
vwmaniaman Offline
vwmaniaman  Offline
Joined: Apr 2013
Posts: 181
Kevil,Ky
I use 0-20 synthetic oil in mine and wix filter and change at 7.5k. Has worked great. Love the Mazda5 that we have and is just over 90k now.


Don't waste your time on a slipshod repair.
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496053
08/23/17 10:41 AM
08/23/17 10:41 AM
Joined: Aug 2012
Posts: 2,182
Oregon
MrQuackers Offline OP
MrQuackers  Offline OP
Joined: Aug 2012
Posts: 2,182
Oregon
Great! Will this synblend be OK for 5k miles?


Master the 1000 yard stare

coffeeMobil 1 USA
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496061
08/23/17 10:53 AM
08/23/17 10:53 AM
Joined: Apr 2013
Posts: 181
Kevil,Ky
vwmaniaman Offline
vwmaniaman  Offline
Joined: Apr 2013
Posts: 181
Kevil,Ky
I am sure it will be. Just enjoy that simple reliable 2.5L motor.


Don't waste your time on a slipshod repair.
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496123
08/23/17 12:22 PM
08/23/17 12:22 PM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
I remember when 5w30 didn't exist.

Don't worry about the W's until its 20 below.

You should run a straight 20 Spring through Fall smile

and ... Lemme know if you find a good one.

Last edited by ARCOgraphite; 08/23/17 12:23 PM.

2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496125
08/23/17 12:24 PM
08/23/17 12:24 PM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
BP 5w20 MagnAtec is Stunning - try it!


2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496565
08/23/17 11:00 PM
08/23/17 11:00 PM
Joined: Sep 2015
Posts: 2,477
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,477
Malaysia
Originally Posted By: MrQuackers
Great! Will this synblend be OK for 5k miles?

I'm afraid 10k miles OCI should be considered for Castrol blend.

Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers] #4496575
08/23/17 11:48 PM
08/23/17 11:48 PM
Joined: Feb 2009
Posts: 229
Pennsylvania
K23Turbo Offline
K23Turbo  Offline
Joined: Feb 2009
Posts: 229
Pennsylvania
Nike. Just do it.

I'd run it.

Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: alarmguy] #4496606
08/24/17 02:45 AM
08/24/17 02:45 AM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline
Vladiator  Offline
Joined: Jan 2016
Posts: 849
NC
Originally Posted By: alarmguy
No engine, not just Mazda would care if it was 0/20 or 5/20 or 5/30.

Mostly true, except for some Hemi 5.7 engines, with cylinder deactivation... Those will even start acting up if you simply use a "thick" 0w20/5w20. That is according to Hemi forums. Never had one myself, yet.

Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: vwmaniaman] #4496792
08/24/17 08:07 AM
08/24/17 08:07 AM
Joined: Jun 2015
Posts: 9
Virginia
Hoot_r Offline
Hoot_r  Offline
Joined: Jun 2015
Posts: 9
Virginia
Originally Posted By: vwmaniaman
I use 0-20 synthetic oil in mine and wix filter and change at 7.5k. Has worked great. Love the Mazda5 that we have and is just over 90k now.


Have a 2014 Mazda 5 2.5L with just over 60K; been using 0-20 AFE pretty religiously, but may start looking at something a bit thicker. Love this vehicle; too bad Mazda decided to pull them from the US sales market.

On a different note, does the 2.5 non-Skyactiv engine use direct injection? Might explain some of the knocking of late at low revs under load. Use 87 Costco fuel almost exclusively, but wondering about carbon buildup if this is a DI engine.


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