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#1533598 - 07/16/09 01:01 AM 20W50
grease_monkey Offline


Registered: 12/08/08
Posts: 325
Loc: oregon
Ok my curiosity is running wild. It seems as though the thicker oils are going the way of the dodo bird and that the thin oils are here to stay. But here is my question. Who still uses 20W50 oil? what do you use it in and why? and last but not least would you use it in a vehicle that is under 15 years of age, and under 200,000 miles?

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#1533599 - 07/16/09 01:04 AM Re: 20W50 [Re: grease_monkey]
FZ1 Offline


Registered: 02/07/08
Posts: 4192
Loc: Texas
I don't even use that syrup in my bikes!

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#1533602 - 07/16/09 01:05 AM Re: 20W50 [Re: FZ1]
grease_monkey Offline


Registered: 12/08/08
Posts: 325
Loc: oregon
Let me be more clear. I am looking for people who use it. not people who don't

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#1533608 - 07/16/09 01:15 AM Re: 20W50 [Re: grease_monkey]
wirelessF Offline


Registered: 10/04/07
Posts: 1165
Loc: Oahu, Hawaii
I use 20W50 in my 1990 Toyota 4Runner. In the user manual there is a guide to see what oil weight should be used depending on the climate. Since I live in Hawaii, a 40 or 50 weight is used in this truck.

Similar from my truck's manual:



Edited by wirelessF (07/16/09 01:17 AM)
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For racing or off-road use only!

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#1533612 - 07/16/09 01:18 AM Re: 20W50 [Re: wirelessF]
aquariuscsm Offline


Registered: 12/30/06
Posts: 8924
Loc: South Texas,USA
I`ve been using 20W50/15W50 in every car I`ve owned. Here`s a page out of the 1990-1996 Z32 FSM:


Edited by aquariuscsm (07/16/09 01:21 AM)
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

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#1533618 - 07/16/09 01:27 AM Re: 20W50 [Re: aquariuscsm]
maximus Offline


Registered: 01/24/08
Posts: 206
Loc: TX
We run straight 50 wt in the Cessnas and Pipers I fly

I guess it's more ideal for aircraft because they're air cooled which is less consisent than water cooled engines.
_________________________
2011 Sonata GLS.

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#1533693 - 07/16/09 06:16 AM Re: 20W50 [Re: maximus]
Hermann Offline


Registered: 08/10/05
Posts: 2286
Loc: Kansas City
Lots of people use it in air cooled motorcycles. I use Maxlife 20w-50 in my 1991 BMW R100. It is the grade that is recommended by BMW. Older BMW cars use it also. I have found that it is getting harder to find at superstores, but still readily at Auto part stores.
_________________________
2008 Tacoma AC I-4 5 speed manual-Valvoline WB 5w-20-Purolator L10241
1991 BMW R100GS 20w-50 Maxlife + Mahle OX36D filter

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#1533707 - 07/16/09 06:40 AM Re: 20W50 [Re: Hermann]
daman Offline


Registered: 09/23/06
Posts: 10419
Loc: Bad Axe, MI
I use 15w40 and 20w50 in my ATV's because they run red hot and less shearing goes on...
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

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#1533708 - 07/16/09 06:41 AM Re: 20W50 [Re: Hermann]
tomcat27 Offline


Registered: 06/25/09
Posts: 2402
Loc: Midwest
I use it in my boats (which are GM V6 & V8 blocks)

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#1533740 - 07/16/09 07:19 AM Re: 20W50 [Re: tomcat27]
Carbuff Offline


Registered: 12/11/06
Posts: 101
Loc: Lost in the Garden State
I use M1 15W-50 (20W-50 is specified) in my 1988 Lotus Esprit Turbo.

Another reason for non-turbo applications to use it, is that Mobil has increased the ZDDP in it. This is good for the cams and followers. Not as good for the catalyst...

I understand that several other brands' formulations of heavier oil now still have ZDDP. Look for the SL spec.
_________________________
Atwell Haines
NJ

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#1533742 - 07/16/09 07:22 AM Re: 20W50 [Re: grease_monkey]
bigmike Offline


Registered: 06/05/09
Posts: 3239
Loc: Florida
 Originally Posted By: grease_monkey
Ok my curiosity is running wild. It seems as though the thicker oils are going the way of the dodo bird and that the thin oils are here to stay. But here is my question. Who still uses 20W50 oil? what do you use it in and why? and last but not least would you use it in a vehicle that is under 15 years of age, and under 200,000 miles?


I used it in my 1986 truck for over 10 years. Worked fine. Even used it with those "restrictive" Pure One filters and without a thermostat! Then again, I live in Florida and it doesn't get below 30 degrees but a few times a year.

Would I use it on my nice, new vehicles. Not so much. I think engineering is much better today.
_________________________
Take care,
-Mike

2006 Chevy Silverado LT 4.8 - QS 5w30, Napa Gold
2009 Honda Accord LX-P 2.4 - QS UD 0w20, P1 14610

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#1533751 - 07/16/09 07:33 AM Re: 20W50 [Re: bigmike]
Falcon_LS Offline


Registered: 10/03/08
Posts: 3407
Loc: Kuwait
I've used it for the first 125,000 miles of my truck's life. Now I've switched to synthetic.
_________________________
00 Pajero: M1 0W-40/26300-35503
01 Marquis: M1 10W-60/FL820S
05 Envoy: M1 ESP Formula 5W-30/51522XP

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#1533752 - 07/16/09 07:33 AM Re: 20W50 [Re: bigmike]
TallPaul Offline


Registered: 10/22/03
Posts: 12897
Loc: By Detroit
Best use for 20w50 is to thicken your 10w30 in the summer at a ratio of about 1:4, which will bring the modern 10 cSt 30 weight up to an old fashioned 12 cSt 30 wt.
_________________________
"There is a slight vibration in it that I always attributed to something I can't explain." --Neil Young

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#1533934 - 07/16/09 11:12 AM Re: 20W50 [Re: Carbuff]
aquariuscsm Offline


Registered: 12/30/06
Posts: 8924
Loc: South Texas,USA
 Originally Posted By: Carbuff

I understand that several other brands' formulations of heavier oil now still have ZDDP. Look for the SL spec.


^^I noticed my jug of Mobil 1 15W50 silver cap has the SM,SL,and CF specs,but my jug of Pennzoil yellow bottle only has SM spec. What exactly does all that translate to when it comes to the ingredients/additives in both oils? Either one more robust/tougher than the other? The way my car performs with both oils,Pennzoil 20W50 yellow bottle wins hands down.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

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#1533939 - 07/16/09 11:15 AM Re: 20W50 [Re: TallPaul]
BuickGN Offline


Registered: 10/18/07
Posts: 3756
Loc: CA
I run it in the GN and have for many years. Clearances are stockish except for piston to cylinder. It won't live on anything thinner.

To clarify, I use this year round and it works great. Believe it or not, the thick stuff eliminated the rod knock I experienced for the first second or two on startup on my older worn engine. It seemed to build pressure quicker on the thick stuff which goes against everything we read about on here.
_________________________
84 Buick GN. 10.60@127 old times. 602hp 620lbs.
06 Acura TL. Lots of suspension and brake mods.

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