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Oil consumption rise after changing oil type. #4500038
08/28/17 05:28 AM
08/28/17 05:28 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline OP
uart  Offline OP
Joined: Jun 2010
Posts: 739
Australia
I recently decided to try a new oil in my wife's 2005 Prius (at 310,000 km). Previously I've (mostly) been using Castrol Edge 5W30 A3/B4, but recently I changed to Penrite Enviro+ GF5 5W30.

I've not been unhappy with the performance of the new oil, the engine is still running sweet and cold starts sound smooth and all, but I've noticed a fair bit of a jump in oil consumption since the latest change.

I guess that the Penrite oil is probably one that not too many here would know a lot about, being a local Australian blender. However I don't think it's a bad oil, it's SN, GF5 and certified Dexos1.

Mild to moderate oil consumption is very common in higher mileage gen2 Prius, so my previous oil consumption of about 300mL per 3000km (2000 miles) was no great concern to me, but since changing to the new oil it seems to have suddenly risen by somewhere around 50% to 75% more.

Just wondering if viscosity differences alone could account for the difference in oil consumption, or if there is something else going on.

The Castrol has a KV of 72/12 cSt (@40/100C), CCV 6500 cP @-30C, and HTHS of 3.6 cP.
The Penrite has a KV of 63/11 cSt (@40/100C), CCV 4850 cP @-30C, and (I think) HTHS of 2.9 cP.

Penrite Data Here
Edge Data Here

Last edited by uart; 08/28/17 05:31 AM.
Re: Oil consumption rise after changing oil type. [Re: uart] #4500040
08/28/17 05:34 AM
08/28/17 05:34 AM
Joined: Dec 2002
Posts: 41,547
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,547
'Stralia
HTHS (and the other viscometric factors around it) are IMO probably the major causative.

Volatility in the lighter GFs cold help in consumption too.

Re: Oil consumption rise after changing oil type. [Re: uart] #4500049
08/28/17 05:55 AM
08/28/17 05:55 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline OP
uart  Offline OP
Joined: Jun 2010
Posts: 739
Australia
Yeah, there's a fairly big viscosity difference there despite them both being 5w30's.

I'm not sure about volatility differences as neither of them seem to publish noack figures. But yeah, the lighter Enviro oil could have higher volatility.

The Enviro+ stuff definitely has better cold cranking properties, and if I lived in an Alpine region it might even make a worthwhile difference, but up here in Newcastle where temps are over +10C 99% of the time I don't think there is any meaningful benefit.

I've used all my Edge 5w30 stash now and the Enviro just seemed like a good price for a "full synthetic" (about $42 pre 5L bottle on supercheap auto's 20% off days).

Next change I might just go with Magnatec 10W30 as that can always be had at a fairly decent price here. And the old prius definitely doesn't need anything too special. smile

Re: Oil consumption rise after changing oil type. [Re: uart] #4500055
08/28/17 06:02 AM
08/28/17 06:02 AM
Joined: Dec 2002
Posts: 41,547
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,547
'Stralia
Originally Posted By: uart
Next change I might just go with Magnatec 10W30 as that can always be had at a fairly decent price here. And the old prius definitely doesn't need anything too special. smile


That's exactly what I was going to suggest...but didn't

Re: Oil consumption rise after changing oil type. [Re: Shannow] #4500064
08/28/17 06:16 AM
08/28/17 06:16 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline OP
uart  Offline OP
Joined: Jun 2010
Posts: 739
Australia
Originally Posted By: Shannow

That's exactly what I was going to suggest...but didn't


You know what they say, great minds think alike. wink

Re: Oil consumption rise after changing oil type. [Re: uart] #4500089
08/28/17 06:49 AM
08/28/17 06:49 AM
Joined: Sep 2003
Posts: 3,135
Austin, Texas
Brons2 Offline
Brons2  Offline
Joined: Sep 2003
Posts: 3,135
Austin, Texas
That's an A3 rated oil versus what looks like a US/API spec oil, not surprised it's consuming more oil.

Try an A3 rated Penrite, see how that goes. I bet it slows consumption.

I'm not convinced Magnatec will help if the specs are more like the Penrite, even though it's 10w30. I'd stick to an A3 rated oil or similar if that was working for you. Or just go Xw40.


2012 Hyundai Sonata GLS 6MT 2.4GDI, ProDS 10w30, XG9688 filter, 2018 Mitsubishi Outlander SEL 2.4 CVT, Factory fill still.
Re: Oil consumption rise after changing oil type. [Re: Brons2] #4500133
08/28/17 07:50 AM
08/28/17 07:50 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline OP
uart  Offline OP
Joined: Jun 2010
Posts: 739
Australia
Originally Posted By: Brons2
That's an A3 rated oil versus what looks like a US/API spec oil, not surprised it's consuming more oil.


Yes it's an A3/B4 rated oil up against the more fuel economy conscious Dexo1 rating. And there's a fair bit of viscosity difference despite them both being 5w30's.

The Magnatec 10W30 is also ACEA A3/B4 rated, so hopefully it will behave more like the Edge. Being a 10W oil of course it has poorer cold cranking properties than either of the previous two, though I don't think that will bother me too much in this climate.

The key Magnatec viscosity specs are:

KV = 84/12.4 cSt (@ 40/100C). CCV = 6640 cP (@ -25C) and HTHS >= 3.5 cP (as per A3/B4 specs).

Magnatec data: here.

Last edited by uart; 08/28/17 07:54 AM.
Re: Oil consumption rise after changing oil type. [Re: uart] #4500191
08/28/17 08:49 AM
08/28/17 08:49 AM
Joined: Nov 2008
Posts: 912
Oklahoma
CELICA_XX Offline
CELICA_XX  Offline
Joined: Nov 2008
Posts: 912
Oklahoma
I had the same problem with an almost identical engine (1NZ-FE)

When I finally decided to switch to Valvoline MaxLife Full Synthetic, my oil consumption dropped SIGNIFICANTLY.


15 Toyota Prius - M1 EP 0w20 SN+
02 Toyota ECHO - Valv MaxLife Full Syn 5w30 SN+
97 Lexus LX450 - M1 EP HM 5w30 SN+
93 Lexus LS400 - Valv MaxLife Full Syn 5w30
Re: Oil consumption rise after changing oil type. [Re: CELICA_XX] #4500211
08/28/17 09:06 AM
08/28/17 09:06 AM
Joined: Jun 2010
Posts: 739
Australia
uart Offline OP
uart  Offline OP
Joined: Jun 2010
Posts: 739
Australia
Originally Posted By: CELICA_XX
I had the same problem with an almost identical engine (1NZ-FE)

When I finally decided to switch to Valvoline MaxLife Full Synthetic, my oil consumption dropped SIGNIFICANTLY.


It's funny, I was also thinking about trying the Maxlife when I noticed the recent oil consumption rate on the Enviro+ oil.

Unfortunately it's very hard to find around here. The best I could manage to find was some overpriced semisynth (red bottle) in 20W50 at about $50 per 5L bottle. No other grades available cry so I passed on that!

Last edited by uart; 08/28/17 09:07 AM.
Re: Oil consumption rise after changing oil type. [Re: uart] #4500215
08/28/17 09:07 AM
08/28/17 09:07 AM
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
bigj_16 Offline
bigj_16  Offline
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
Originally Posted By: uart
Originally Posted By: CELICA_XX
I had the same problem with an almost identical engine (1NZ-FE)

When I finally decided to switch to Valvoline MaxLife Full Synthetic, my oil consumption dropped SIGNIFICANTLY.


It's funny, I was also thinking about trying the Maxlife when I noticed the recent oil consumption rate on the Enviro+ oil.

Unfortunately it's very hard to find around here. The best I could manage to find was some overpriced semisynth (red bottle) in 20W50 at about $50 per 5L bottle. cry Anyway I passed on that!

Yeah, but that is $50 AUD. That doesn't count. smile

Re: Oil consumption rise after changing oil type. [Re: uart] #4500227
08/28/17 09:14 AM
08/28/17 09:14 AM
Joined: Feb 2011
Posts: 6,769
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,769
Hudson, NH
I get that changing oil brands on some vehicles I've owned. Especially switching over to M1. After 2-3 OCI's consumption goes back to or close to what it was before. Only reason I can come up with is the time it takes for the diff brand oil to replace the coating/glaze the former oil has on moving parts like the cyl walls and valve seals. And for others there is an issue with consumption, and the oils that don't creep and flow as well cause less burn off. Or.. Whats the flashpoint of each? Maybe some is really "burning"


06 Escalade 6.0L LQ9 AWD 165k M1 0w40
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Oil consumption rise after changing oil type. [Re: uart] #4500307
08/28/17 10:50 AM
08/28/17 10:50 AM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
Colorado
We have seen this in numerous posts...some cars will drink certain oils. Switching back should cure the issue.


Thick vs Thin test: 15k / 43k miles complete

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