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#4759261 - 05/16/18 09:36 PM 20w50 film strength
MikeyWikey Offline


Registered: 05/16/18
Posts: 1
Loc: Green Bay
Which 20w50 oil has the highest film strength?
Does 20w50 have higher film strength than 0w40?
Is 0w40 Mobil 1 safe to use in my 1980 Porsche 924 which calls for 20w50?

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#4759263 - 05/16/18 09:39 PM Re: 20w50 film strength [Re: MikeyWikey]
69Torino Offline


Registered: 12/12/17
Posts: 322
Loc: Indy
Is it air cooled? Iím guessing so, and if it is I would definitely stick to a 50 weight oil. Especially in a car that is designed to be driven spiritedly.
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#4759288 - 05/16/18 10:01 PM Re: 20w50 film strength [Re: 69Torino]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7485
Loc: S California
Originally Posted By: 69Torino
Is it air cooled? Iím guessing so, and if it is I would definitely stick to a 50 weight oil. Especially in a car that is designed to be driven spiritedly.


A 924 is a water-cooled VW/Audi engine with a Porsche badge. Switching from a 50w to a 40w should be no problem.

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#4759289 - 05/16/18 10:02 PM Re: 20w50 film strength [Re: MikeyWikey]
Imp4 Offline


Registered: 04/06/18
Posts: 337
Loc: Somewhere in time
You could go ask 540Rat.... hide
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#4759306 - 05/16/18 10:20 PM Re: 20w50 film strength [Re: MikeyWikey]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18450
Loc: Dallas,Tx USA
Maybe RP XPR 20W50.
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#4759308 - 05/16/18 10:22 PM Re: 20w50 film strength [Re: MikeyWikey]
burla Offline


Registered: 11/07/16
Posts: 257
Loc: sonoma
Not 0w40, many oil manu's use that weight to be closer to a 5w30 then anything. I'm not saying it isn't safe to use in your car, just a comment on film strength.

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#4759315 - 05/16/18 10:36 PM Re: 20w50 film strength [Re: MikeyWikey]
PimTac Offline


Registered: 03/04/17
Posts: 4950
Loc: Soviet State of Washington
Merky would love a thread like this.
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#4759319 - 05/16/18 10:45 PM Re: 20w50 film strength [Re: MikeyWikey]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4580
Loc: North Carolina
I'd use M1 5W-50 or 15W-50 if it were mine and I put it through it's paces. Actually, I'd probably just use a Conventional HDEO like Delo or Delvac 15W-40.
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#4759332 - 05/16/18 11:00 PM Re: 20w50 film strength [Re: MikeyWikey]
Snagglefoot Offline


Registered: 12/31/17
Posts: 2083
Loc: SE British Columbia, Canada
Originally Posted By: MikeyWikey
Which 20w50 oil has the highest film strength?
Does 20w50 have higher film strength than 0w40?
Is 0w40 Mobil 1 safe to use in my 1980 Porsche 924 which calls for 20w50?


Here you go.


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#4759337 - 05/16/18 11:04 PM Re: 20w50 film strength [Re: MikeyWikey]
BrocLuno Offline


Registered: 09/06/15
Posts: 5691
Loc: Kalifornia Kollective
Yup, Silver Bottle VR-1 for street driven engines. It is the good stuff when it comes to these heavier grades. Well known and proven at tracks all across the country every weekend smile
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4759348 - 05/16/18 11:25 PM Re: 20w50 film strength [Re: MikeyWikey]
dogememe Offline


Registered: 04/15/17
Posts: 816
Loc: SF BAY AREA, CA
I've never heard a bad thing about VR-1 and we sell a TON of it at work at the parts store. If you wanted a synthetic you could use Royal Purple HPS, it's not that much more. I am no expert in your type of car but I would stick with a 20w-50.

https://www.youtube.com/watch?v=xmBdX4BhtME
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#4759583 - 05/17/18 08:40 AM Re: 20w50 film strength [Re: MikeyWikey]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2531
Loc: Balearic Islands , Spain
Valvoline VR1 20W-50 is great, that Porsche will be more than happy on it!
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1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.

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#4759711 - 05/17/18 10:29 AM Re: 20w50 film strength [Re: MikeyWikey]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1330
Loc: Oregon
Mobil 1 15W-50 would be perfect for this application. Itís a very robust oil. Itís essentially a synthetic 20W-50. Same thickness, better cold properties.
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#4760062 - 05/17/18 03:24 PM Re: 20w50 film strength [Re: MikeyWikey]
racin4ds Offline


Registered: 05/07/10
Posts: 1046
Loc: Ocala, Florida
Ignore the thin oil guys on this one! Run the VR1 20W50!! That old motor was designed for it and needs the additives that are exempt from todays junk PCMO's
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#4760115 - 05/17/18 04:26 PM Re: 20w50 film strength [Re: MikeyWikey]
jayg Offline


Registered: 10/04/12
Posts: 1211
Loc: Rabbit Creek, Alaska
Why in the world are some of you recommending a 20w50 racing oil for a 110 hp VW 4 cylinder?

Any good conventional oil from 40 to 50 wt would be perfect in this. I'm guessing most here don't know what a 924 is.

OP if you already have the 0w40 us it. If you don't , buy a cheap conventional 40-50 wt and run it.
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