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Anyone still using 20w50? #5260165 11/06/19 06:14 PM
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mpack88 Offline OP
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Is there anyone that still fans of 20w50 or is that weight obsolete now. I'm curious of using in my 88 Ford f150 302 in the summer.

Last edited by wwillson; 11/06/19 07:32 PM. Reason: subject clarification
Re: Anyone still using 20w50? [Re: mpack88] #5260170 11/06/19 06:16 PM
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Jimmy_Russells Offline
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No point really unless it's an oil burner. I have literally had that same engine making over 650 hp and used 10w30.

Re: Anyone still using 20w50? [Re: mpack88] #5260182 11/06/19 06:26 PM
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Tahoe4Life Offline
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Originally Posted by mpack88
Is there anyone that still fans of 20w50 or is that weight obsolete now. I'm curious of using in my 88 Ford f150 302 in the summer.


I put 20w50 in a 88 Town Car with the 302. I thought it would blow up when I started it when the engine was cold as it made so much noise. Took it out a few days later and went back to 5w30 and 10w30. All was nice and quiet again.


2016 Chevrolet Tahoe LT
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Re: Anyone still using 20w50? [Re: mpack88] #5260198 11/06/19 06:49 PM
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Bud Offline
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Still use it in my 71 MGB


2016 Honda Pilot EX-L with NAVI.....Mobil 1 0w20 AFE and Honda OEM Filter
Re: Anyone still using 20w50? [Re: mpack88] #5260204 11/06/19 06:57 PM
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mpack88 Offline OP
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Well I don't see smoke, but it does use 1qrt every 1k.

Re: Anyone still using 20w50? [Re: mpack88] #5260207 11/06/19 07:02 PM
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skyactiv Offline
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Why not just be old school and use a 30W?

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Re: Anyone still using 20w50? [Re: Bud] #5260208 11/06/19 07:02 PM
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Malo83 Offline
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Use it in my tired 305 during the summer triple digit summers.

Re: Anyone still using 20w50? [Re: mpack88] #5260211 11/06/19 07:05 PM
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skyactiv Offline
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Wife: 15' Audi A4 quattro 6 speed manual
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Re: Anyone still using 20w50? [Re: mpack88] #5260212 11/06/19 07:05 PM
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Red91 Offline
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Nothing wrong with it in the right application. It has never had many fans on this forum, but I've used it on and off over the years in Chevy small blocks

I like skyactivs suggestion of a straight 30 for your 302 as well. I think you'll actually find more people here favor 30 than 20/50.

Last edited by Red91; 11/06/19 07:08 PM.

05 Chevy Impala
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Re: Anyone still using 20w50? [Re: mpack88] #5260219 11/06/19 07:15 PM
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Randy_R Offline
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My brother-in-law used in an MG Midget recommended for engine and trans I think a lotta Brits in that era used the same


2018 Mazda CX-5 6600 miles Zepro advanced moly 0W-20 Mazda filter
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65 Pontiac Tempest 355 Chevy Schaeffer Racing 10W30 K&N
Re: Anyone still using 20w50? [Re: Red91] #5260222 11/06/19 07:23 PM
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mpack88 Offline OP
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How cold or hot can straight 30 be used?

Re: Anyone still using 20w50? [Re: mpack88] #5260225 11/06/19 07:26 PM
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userfriendly Offline
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I have 12 quarts of 20w50 Castrol motorcycle to try in my Duramax LML next spring.
You can make your own 20W50 by adding SAE 50 to 15W40.

Re: Anyone still using 20w50? [Re: mpack88] #5260231 11/06/19 07:30 PM
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I use more 20W-50 than any other weight.

Having two old British Leyland vehicles around that spec it, plus badly worn rings on the one that gets driven the most by far means that I can easily chew through a lot of the stuff.


2010 Lincoln MKZ-Mobil 1 5W-30
1970 MG MGB Roadster-Valvoline VR-1 20W-50
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Re: Anyone still using 20w50? [Re: mpack88] #5260232 11/06/19 07:32 PM
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OVERKILL Offline
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Originally Posted by mpack88
Well I don't see smoke, but it does use 1qrt every 1k.


Can't remember if that one had the intake with the PCV in a grommet on the back of it like the car engines, but if it does, there's a screen underneath it that gets plugged up and causes oil consumption. The 302 definitely does NOT need 20w-50, I'd run a cheap 15w-40 in it given your location and the fact it is consuming.


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Re: 20w50 [Re: mpack88] #5260234 11/06/19 07:34 PM
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bullwinkle Offline
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Originally Posted by mpack88
How cold or hot can straight 30 be used?
It's been stated, both here & in my GM diesel owner's manuals (6.2 ones) that 32F/0C is pretty much the minimum recommended temp for SAE 30 dino, although if a little warm up is allowed & it'll crank fast enough to start, I would go as low as zero to +5F. I've started (worn-out) engines with 20W50 below 0F before with no issues.


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