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#3247272 - 01/13/14 05:32 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
SHOZ Offline


Registered: 06/28/03
Posts: 1855
Loc: Illinois
M1 0w40.

I've run the 5w30 M1 and it will hit the 75 lbs when cold.

I should add I have a remote filter but the pressure sensor is after that.

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#3247281 - 01/13/14 05:38 PM Re: Running 0W-40 where 5W-30 is specified [Re: aquariuscsm]
CATERHAM Offline


Registered: 11/18/05
Posts: 9712
Loc: Burlington, Ontario, Canada
Originally Posted By: aquariuscsm
My car came with a sticker under the hood that says "10W is preferred" and recommends 10W30 and 10W40. Is their any advantages to me running 10W40 instead of 10W30 "wear wise" and/or vise versa?

And 15W-40 was spec'd for '96 BMW and even heavier grades for my '86 Porsche but 5W-30 and 0W-40 have been back spec'd for both cars respectively.
GC 0W-30 or M1 0W-40 would both be superior choices to a 10W-40 for a 300ZX. Even QS Defy 5W-30 would be a good choice.
_________________________
74 Lotus Europa 5W-50
86 Porsche 928S TGMO 0W-20 25%/M1 0W-40
96 BMW 328i Idemitsu/TGMO 0W-20 70%/M1 0W-40
94 Caterham 7 Sustina 0W-20 80%/0W-50

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#3247290 - 01/13/14 05:44 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
Clevy Offline


Registered: 11/11/10
Posts: 7629
Loc: Saskatoon canada
Originally Posted By: Shannow
If you have a pressure gauge, it reaches a figure then stays pegged. You can rev it cold, and see where it tops out at.

If you aren't on it continuously, then no problem...if you are, then still no problem, you are wasting energy.



My charger hits that at 65psi. It won't go any higher so I'm assuming that's my by-pass psi.

Originally Posted By: novadude
I don't really care if the pump is in bypass at high revs. I don't spend a lot of time at high revs. Besides, ALL oil pumps go into bypass at high revs, even with 0W-20.

Higher HTHS generally means higher film strength too, right? Better protecion?


Well not really.
If your engine only requires "x" film strength adding more doesn't mean less wear because the moving parts have an oil film separating them. A thicker oil film will add drag even if it's minutely.
However like I've already said the 0w-40 is something special. Nissan recommended it specifically for their race engines as well as Porsche and so on.
It's the only oil I'd break my boycott for to be honest,unless of course it was really cheap.
_________________________
2006 Charger RT
Miles x 2 per oil filter

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#3247292 - 01/13/14 05:45 PM Re: Running 0W-40 where 5W-30 is specified [Re: SHOZ]
CATERHAM Offline


Registered: 11/18/05
Posts: 9712
Loc: Burlington, Ontario, Canada
Originally Posted By: SHOZ
M1 0w40.

I've run the 5w30 M1 and it will hit the 75 lbs when cold.

I should add I have a remote filter but the pressure sensor is after that.

M1 0W-40 is heavier than necessary since you're not seeing high oil temp's.
I'd resume using the recommended 5W-30 grade at the next OCI.
_________________________
74 Lotus Europa 5W-50
86 Porsche 928S TGMO 0W-20 25%/M1 0W-40
96 BMW 328i Idemitsu/TGMO 0W-20 70%/M1 0W-40
94 Caterham 7 Sustina 0W-20 80%/0W-50

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#3247297 - 01/13/14 05:52 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
SHOZ Offline


Registered: 06/28/03
Posts: 1855
Loc: Illinois
That's my plan. Originally I did have oil temp problems big time. I then put on a tube and fin oil cooler that was less that stellar in performance and the adapter for it had thermostatic control at 160F. Too low when it was cool and was marginally effective when it was hot.

I've since gone to a water/oil heat exchanger on the filter mount. The radiator is way bigger than stock. I'm hoping this will take care of the heat. Most I've seen since putting that on is 215F at +90F ambient, AC on and 75 mph interstate travel. When it is cold the temp runs around 170-180F. T-stat is 180F.

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#3247298 - 01/13/14 05:53 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
CATERHAM Offline


Registered: 11/18/05
Posts: 9712
Loc: Burlington, Ontario, Canada
Originally Posted By: novadude
I don't really care if the pump is in bypass at high revs. I don't spend a lot of time at high revs. Besides, ALL oil pumps go into bypass at high revs, even with 0W-20.

Higher HTHS generally means higher film strength too, right? Better protecion?

Yes even with a 0W-20 you'll need oil temp's of 65-70C before you can use maximum rev's out of by-pass.

Higher HTHSV means the oil is heavier, period even at low normal operating temp's. It's simply more accurate to refer to an oil's HTHSV rating (if you know it) than it's KV100 spec'.
_________________________
74 Lotus Europa 5W-50
86 Porsche 928S TGMO 0W-20 25%/M1 0W-40
96 BMW 328i Idemitsu/TGMO 0W-20 70%/M1 0W-40
94 Caterham 7 Sustina 0W-20 80%/0W-50

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#3247483 - 01/13/14 08:37 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
Shannow Online   content


Registered: 12/12/02
Posts: 27074
Loc: a prison island
Why would you be limiting your revs to stay out of bypass relief ?

Limiting revs because your pistons aren't round, and your block isn't straight is sensible...not bypass.

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#3247509 - 01/13/14 09:00 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
SHOZ Offline


Registered: 06/28/03
Posts: 1855
Loc: Illinois
At least for me the coolant can be up to temp, it is the oil that takes another 10 minutes/miles.

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#3247735 - 01/14/14 04:17 AM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
virginoil Offline


Registered: 09/05/05
Posts: 1064
Loc: western australia
Penrite has a plus 10 philosophy for vehicles in OZ see link below.

http://www.penriteoil.com.au/tech_pdfs/2...Extra%20Ten.pdf

The +10 is self explanatory. Unless you see snow I would use M1 5w-40 grade ie the same brand and additive package used by M1 5w30.

However at 147 000 miles ie approx 250 000 kms why change ?

Enough posts about switching causing leaks on this forum. The add pack in M1 0w40 I understand has much better cleaning properties, is it something you want to risk and take on at this stage of engine life ?

In summary IMO if its all good.
1. Thank God
2. Keep doing what you have been doing.
3. Switching causing leaks is not myth.


Edited by virginoil (01/14/14 04:30 AM)
_________________________
Hmmmmmmmmm now which tree/s in the Garden did He say I can eat from ?

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#3248067 - 01/14/14 12:04 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
Maxima97 Offline


Registered: 02/11/12
Posts: 322
Loc: WA - Washington
People in this forum thought they were out smarter than oil refinary and auto manufacturer by mixing their own cocktail without scientific proof. The result is unknown. But there must be a reason user manual suggests using particular weight of oil.
_________________________
97 Maxima, Maxlife 5W30
99 LX470,PU 5W30
98 Explorer,PU 5W30
93 Prizm, PU 5W30
01 Camry,G oil 5W30
95 Villager,Maxlife 5W30
05 Accord,Idemitsu 0W20

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#3248172 - 01/14/14 01:59 PM Re: Running 0W-40 where 5W-30 is specified [Re: CATERHAM]
ukmastermind Offline


Registered: 08/07/12
Posts: 105
Loc: Los Angeles, CA
Doesn't 0w-40 have better flow at any lower temp. than 5w-30??

That + the extra zinc/phos would make the 0w-40 better in my book smile

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#3248312 - 01/14/14 03:56 PM Re: Running 0W-40 where 5W-30 is specified [Re: ukmastermind]
901Memphis Online   content


Registered: 08/14/10
Posts: 6318
Loc: Northern Kentucky
Originally Posted By: ukmastermind
Doesn't 0w-40 have better flow at any lower temp. than 5w-30??

That + the extra zinc/phos would make the 0w-40 better in my book smile


No not necessarily. Depending on the product the 5w30 synthetic should be lighter until a certain point.
_________________________
1999 Ford Taurus 146k (Vulcan v6) - M1 High Mileage 5w30 | Fram Ultra XG 3600
2002 Buick Century 105k - Peak 5w30 / Fram Ultra XG 3980 / Filter mag

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#3248425 - 01/14/14 06:40 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
ziggy Offline


Registered: 08/08/05
Posts: 1119
Loc: stamford, CT
Would 0w40, or a 5w40 be better for a car that specifies 5w30 (98 corolla) in humid 97-102 degree heat, be better? Last year i ran 10w30 peak synthetic, it was good, but the engine had a watery consistency, i can sense it the oil. would a 0w40 or 5 or even 10w40 be better at those temps?
What i found out, was a 10w30 dino ate up a bit more fuel on me.2 miles a gllon a member here stated to me. the 10w30 synthetic didnt really eat up as much. so becuase its 40 weight, be it 0,5,10..ide imiagine fuel would go up quite abit on me.

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#3248468 - 01/14/14 07:23 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
901Memphis Online   content


Registered: 08/14/10
Posts: 6318
Loc: Northern Kentucky
Ziggy if your cooling system is working properly you should be using an API SN 5w30.
_________________________
1999 Ford Taurus 146k (Vulcan v6) - M1 High Mileage 5w30 | Fram Ultra XG 3600
2002 Buick Century 105k - Peak 5w30 / Fram Ultra XG 3980 / Filter mag

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#3297520 - 02/28/14 04:04 PM Re: Running 0W-40 where 5W-30 is specified [Re: novadude]
splineman Offline


Registered: 08/21/13
Posts: 78
Loc: New Zealand
Penrite recommend the HPR 5 5w-40 as a 5w-30 replacement.
Am I correct in saying that at HTHSV of 3.9 it is too thick, across all temps, as a direct 5w-30 replacement?
Excuse my ignorance if this has been spelled out.
_________________________
'05 Sportster 1200
'89 Honda GB 400

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