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#4727774 - 04/15/18 12:43 PM Pennzoil Platinum 5w20 / 5w30 mix
Anthony Offline


Registered: 09/23/04
Posts: 595
Loc: GA
My 17 GT runs just fine with 5w20 but I am hard on it at times and while 5w20 has long proven itself, is it the best choice for a fairly high strung V8? For 2018 ford made changes to the Coyote V8 but I imagine the clearances are similar. The 18 manual states to use 5w30 on the track but switch back to 5w20 on the street. Surely that has to be CAFE driven. My car holds 8 quarts. I was thinking of going 4 quarts of 5w20 and 4 quarts of 5w30.
Or maybe just a full fill of 5w30. I know mixing is usually not a big deal. I just wonder if there are any chemistry differences that would ultimately make the mix less effective vs just picking a weight and running it.

I know Iím over thinking this lol!
What are your thoughts?
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95 Nissan Hardbody V6 - M1 HM 5w30
13 Nissan Titan - Pennzoil Platinum 5w30
17 Ford Mustang GT - Pennzoil Platinum 5w20

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#4727782 - 04/15/18 12:47 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
barkingspider Offline


Registered: 12/22/13
Posts: 2064
Loc: socal
5w20 for now. If you track it, 5w30. After warranty, use whatever oil u like
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#4727785 - 04/15/18 12:48 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1232
Loc: Winchester, Indiana
Just stick to the 30 weight. You never know when the itch will strike to drive a hole thru the carpet with the accelerator. Your engine will thank you, plus you can eliminate a separate weight from your oil shopping routine.

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#4727793 - 04/15/18 01:00 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
Spector Offline


Registered: 06/10/02
Posts: 3475
Loc: Chattanooga, TN
I have been doing the 50-50 5W20-5W30 mix for the past 5 years on my Hyundai. In my climate I could easily do the 5W30 and manual says acceptable as is a 10W but the 5W20 is on the oil cap. Cannot remember why I decided to go with the 50-50 mix but kind of a habit now. Will never know if any difference over the 5W20.

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#4727799 - 04/15/18 01:07 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: SubieRubyRoo]
demarpaint Offline


Registered: 07/03/05
Posts: 30005
Loc: NY
Originally Posted By: SubieRubyRoo
Just stick to the 30 weight. You never know when the itch will strike to drive a hole thru the carpet with the accelerator. Your engine will thank you, plus you can eliminate a separate weight from your oil shopping routine.


That's what I would do. The truth is with the 50/50 mix you're really not sure without some kind of analysis what the viscosity of the finished product is anyway.
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#4727801 - 04/15/18 01:12 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: demarpaint]
Bryanccfshr Offline


Registered: 10/09/04
Posts: 5727
Loc: Texas, Mentone for work, Galve...
just use 5w30 and you are covered for harder driving.
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#4727803 - 04/15/18 01:19 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
ZZman Offline


Registered: 03/17/08
Posts: 5843
Loc: Michigan
Way too much thinking. 5w-30!
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2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40

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#4727805 - 04/15/18 01:24 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
Just use the 5w-30 if you are concerned.
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#4727815 - 04/15/18 01:34 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: OVERKILL]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
That recommendation to use 5w-30 when tracking could also apply to those driving the car routinely in hot climates. After all, the factory recommendation has to "work" from South Texas to Canada. Neither 5w-20 or 5w-30 could possibly be optimum for both regions. I'd consider Georgia in summer to be fairly "hot" such that a 5w-30 makes a lot more sense than someone driving in Northern Maine. You could always just use a somewhat thinner 30 grade...which I think Pennz Plat still is.
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2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4727818 - 04/15/18 01:36 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
benjy Offline


Registered: 08/23/10
Posts: 906
Loc: pa
being in a hot climate a 10 W would serve you better and a 30 for sure as 20's are as noted for CAFE and NOT your engines health. the 10-30 will have less viscosity improvers and its noack will be better as well

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#4727827 - 04/15/18 01:46 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1908
Loc: SE British Columbia, Canada
For what itís worth, I dropped 5w20 and went to 5w30 for the summer. Might go back to 5w20 this winter but maybe not. My UOA on a 5,000 mile run with 5w20 was excellent.

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#4727854 - 04/15/18 02:16 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
dave1251 Offline


Registered: 07/15/05
Posts: 8698
Loc: Maricopa, AZ
Just use 5W-30. Your engine will not grenade on 5W-20 but it's nice to have a bit of reserve.
_________________________
make the inside of your engine oil cap white.
don't use.

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#4727855 - 04/15/18 02:17 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
dave1251 Offline


Registered: 07/15/05
Posts: 8698
Loc: Maricopa, AZ
I use 30 grades in both vehicles were 5W-20 is recommended.
_________________________
make the inside of your engine oil cap white.
don't use.

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#4727856 - 04/15/18 02:18 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: Anthony]
bubbatime Offline


Registered: 03/18/08
Posts: 5723
Loc: South Florida
5W20 is CAFE driven, and you already know that 5W30 will offer better protection for your engine. So, we already know the answer. Just use 5W30 from now.
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10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4727913 - 04/15/18 03:32 PM Re: Pennzoil Platinum 5w20 / 5w30 mix [Re: ZZman]
fordman65 Offline


Registered: 08/08/12
Posts: 130
Loc: Kentucky
Agreed.
Amen.
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97 Mercury Gran Marquis GS
4.6L V-8 250K
Castrol FS Edge or Castrol FS HM 5W or 10W 30
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