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#4495707 - 08/22/17 11:09 PM Castrol GTX synblend 5w-20 in a Mazda5 2.5?
MrQuackers Offline


Registered: 08/17/12
Posts: 2177
Loc: Oregon
The manual only suggests 0w-20 for USA. Vehicle is well beyond warranty concerns.
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#4495732 - 08/23/17 12:00 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
Rolla07 Offline


Registered: 11/05/11
Posts: 4732
Loc: MTL, CANADA
I dont see why it wouldnt work fine.
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2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4495805 - 08/23/17 05:38 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
alarmguy Offline


Registered: 07/10/12
Posts: 2147
Loc: 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 ...


Edited by alarmguy (08/23/17 05:42 AM)
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#4495859 - 08/23/17 07:21 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
SR5 Offline


Registered: 07/07/15
Posts: 4458
Loc: Down Under
I'm sure you will be fine on 5W20 or even 5W30.
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Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

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#4496019 - 08/23/17 10:33 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
vwmaniaman Offline


Registered: 04/18/13
Posts: 129
Loc: 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.
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#4496053 - 08/23/17 11:41 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
MrQuackers Offline


Registered: 08/17/12
Posts: 2177
Loc: Oregon
Great! Will this synblend be OK for 5k miles?
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Master the 1000 yard stare

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#4496061 - 08/23/17 11:53 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
vwmaniaman Offline


Registered: 04/18/13
Posts: 129
Loc: Kevil,Ky
I am sure it will be. Just enjoy that simple reliable 2.5L motor.
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Don't waste your time on a slipshod repair.

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#4496123 - 08/23/17 01:22 PM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11963
Loc: 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.


Edited by ARCOgraphite (08/23/17 01:23 PM)
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2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

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#4496125 - 08/23/17 01:24 PM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11963
Loc: N.H, U.S.A.
BP 5w20 MagnAtec is Stunning - try it!
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2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

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#4496565 - 08/24/17 12:00 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
zeng Offline


Registered: 09/01/15
Posts: 2184
Loc: 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.

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#4496575 - 08/24/17 12:48 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: MrQuackers]
K23Turbo Offline


Registered: 02/05/09
Posts: 224
Loc: Pennsylvania
Nike. Just do it.

I'd run it.

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#4496606 - 08/24/17 03:45 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: alarmguy]
Vladiator Offline


Registered: 01/04/16
Posts: 728
Loc: 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.
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Thicker oils give protection for severe operations such as driving in mountains, pulling a boat, dusty conditions, short trips, high rpm, overloading, overheating and overcooling. Thin oils give MPG.

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#4496792 - 08/24/17 09:07 AM Re: Castrol GTX synblend 5w-20 in a Mazda5 2.5? [Re: vwmaniaman]
Hoot_r Offline


Registered: 06/10/15
Posts: 9
Loc: 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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