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#4462227 - 07/17/17 07:51 PM Oil Viscosity help which one to use?
TheBeaz Offline


Registered: 07/14/17
Posts: 22
Loc: MN, USA
I have an old Volvo with 200k miles(2.4l NA) and I use full synthetic oil (M1HM) and change it once per year (about 5000 miles-don't drive much) Hasn't burned anything in the last 5k and blowby is minimal. I live in Minnesota where the coldest I have had to drive this car in was about -10 F and the average summer day is 70 F to 85 F but there are times when it can get over 90 F. The first time I changed the oil I put in 10W-30 but upon looking at the viscosity chart in the owners manual it says that 10W-30 is only good until -4 F and 5W-30 is only good until 86 F. My question is can full synthetic 5W-30 and 10W-30 last beyond/below the temperatures in this chart or do I need to switch between seasons or use 5W-40. This doesn't seam right I thought full synthetics could withstand extreme temperatures?

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#4462237 - 07/17/17 08:06 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
TheKracken Offline


Registered: 04/18/17
Posts: 515
Loc: Fort Worth TX
Why not use a euro spec 0w40 year long? The oil is good at minimum for 10k miles if not more, so it should suite you great. M1 0w40 is at walmart right now for 22.88 for 5 quarts
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#4462238 - 07/17/17 08:06 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
pbm Offline


Registered: 04/19/04
Posts: 7605
Loc: New York
Yes, I believe full synthetics can last beyond/ below the temperatures in that chart, IMO.
That chart was written when oils were probably SH (predominately Gr. 1 and lesser quality than modern oils).

If it's not using oil, I'd run 5w30 in winter and 10w30 in summer...If you are using oil, bump it up to 0w40 (Mobil 1 or Castrol Edge)....
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#4462239 - 07/17/17 08:06 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
That chart represents Volvo's requirements most likely for conventional oil. You need to consider Mobil 1's limits. M1 5w-30 would easily handle both ends of your temperature requirements and keep to your once a year change schedule.


Edited by OneEyeJack (07/17/17 08:07 PM)

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#4462241 - 07/17/17 08:07 PM Re: Oil Viscosity help which one to use? [Re: pbm]
TheBeaz Offline


Registered: 07/14/17
Posts: 22
Loc: MN, USA
It was written in 1997

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#4462243 - 07/17/17 08:10 PM Re: Oil Viscosity help which one to use? [Re: OneEyeJack]
TheBeaz Offline


Registered: 07/14/17
Posts: 22
Loc: MN, USA
Thanks, I will likely switch to Pennzoil Platinum high mileage

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#4462248 - 07/17/17 08:14 PM Re: Oil Viscosity help which one to use? [Re: TheKracken]
TheBeaz Offline


Registered: 07/14/17
Posts: 22
Loc: MN, USA
Yeah but is it safe to go out of the manufactures specifications?

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#4462257 - 07/17/17 08:24 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
I think pbm summed it up. Todays synthetics are far better than those dino oils of 97. A 5-30 synthetic IMO will do you fine in the fickle MN weather. Hit 98 here this afternoon. We finally got a nice shot of rain too.
My Scion recommends 5-20 and the Xterra gets 5-30
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#4462268 - 07/17/17 08:38 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
Concur with the above. No reason you couldn't run a 5w30 year round for your yearly OCI.

If you want to abide strictly by the owners manual there's no reason you couldn't also run a 0w40 or 5w40 year round for your annual OCI as well.

Either course of action will be just fine!
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P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4462364 - 07/17/17 10:51 PM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
Oro_O Offline


Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
If I did not start it much below 0F, the M1 10w-30HM is a great oil and worth sticking with it. I use it in most vehicles I take care of (ours, and my parents'). I live in a milder climate where cold cranking visc. is completely unimportant, and not in the Gopher state.

If you have to use it much in the very cold, then the 5w-30 HM variant is a better bet, though not as robust an oil overall. A synthetic 10w is good in fairly cold temps, too - just not as far.

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#4462406 - 07/18/17 12:14 AM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
Nyogtha Offline


Registered: 10/13/14
Posts: 2327
Loc: San Antonio, TX
That chart looks a bit bogus; even in 1997 a 5W-30 and 10W-30 should have the same upper ambient temperature limits as they are both a 30 after the dash. It's just the lower temperature limits that should be different.
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#4462431 - 07/18/17 01:23 AM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: TheBeaz
I live in Minnesota where the coldest I have had to drive this car in was about -10 F and the average summer day is 70 F to 85 F but there are times when it can get over 90 F.


nice summer / brutal winter shocked2

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#4462496 - 07/18/17 06:37 AM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2380
Loc: Balearic Islands , Spain
You could run a full synthetic 5W-30, 0W-40 or 5W-40 year round.
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1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4462507 - 07/18/17 06:52 AM Re: Oil Viscosity help which one to use? [Re: TheBeaz]
ChrisD46 Offline


Registered: 09/10/10
Posts: 1902
Loc: GA.
It's not like we are talking air cooled engines like a old VW Beetle where the outside temps would be a factor . *Isn't this why guys in Texas can run a synthetic 5W20 all year long (including summer) because of radiators ?
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#4462515 - 07/18/17 06:57 AM Re: Oil Viscosity help which one to use? [Re: TheKracken]
Garak Offline


Registered: 12/05/09
Posts: 24586
Loc: Regina, Saskatchewan, Canada
Originally Posted By: TheKracken
Why not use a euro spec 0w40 year long?

This would be my first choice, or whatever dual rated HDEO you happen to find left. Given the price of M1 0w-40 quoted in the States, it's hard to go wrong with that.
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2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
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