Mixing Oil Weights? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironhorse** · 10-29-2021, 05:48 PM

Well seems along with every thing else being on the short list the oil I use in my '05 Tahoe 5.3 LS engine is added in locally here. I use the Quaker State Full Synthetic 5W30 Dexos2 per the owner's manual. Usually change my own oil /filter and the first time I changed oil I found out the capacity is SIX quarts not the usual Five I have been used to for so many years. Bummer having to be sure and buy ONE extra quart each time. Also use Wix filters when I change.

The Change Oil message has come on the DIC screen several times and I know the oil life percentage has reached 0% within the last week. Oil capacity is good on the dipstick, just about halfway to the first mark below full. Problem is can not find a 5W/30 one quart container. Bought the five quart jug okay, checked three local stores, no single 5W/30 to complete the six needed quarts. Closest I can find is a single 5W20 which I did buy. Thinking can't be much of a difference using the one quart of 5/W20 mixed with the five quarts of 5W/30. Any one care to share thoughts on this.

Hate these shortages in everyday products and items needed.

Thealien · 10-29-2021, 06:10 PM

I just buy a few jugs and fill an empty quart up from the jugs.

**truckdude239** · 11-04-2021, 04:55 PM

1 qt of 5w20 wont hurt

**Ironhorse** · 11-04-2021, 07:12 PM

Quote:

Originally Posted by Thealien

I just buy a few jugs and fill an empty quart up from the jugs.

Decided to go this route and filled an empty 5W30 quart container after buying a second full 5 quart jug. Have 4 remaining quarts in that jug so should be good to go for several oil changes.

No WIX filter available at my local parts house. Had to go to an alternative Microguard (?) brand filter? Counter guy said it is made by WIX but is there lower cost alternative? No idea about that, any comments there?

**DPowers** · 11-04-2021, 07:21 PM

I use the two-quart Wix on my 87. Get it through Amazon and can set it up so an automatic delivery.

**kwmech** · 11-05-2021, 12:14 PM

Not going to make that much of a difference. What about when you put additives in the oil?? I look at it as the same thing. Been mixing weights for years on the old school stuff. You just have to be careful if you have a VVt system not to get too crazy. Having clean oil to begin with is the number 1

**hatzie** · 11-05-2021, 05:37 PM

Thankfully 2005 is too early for VVT.

**Ironhorse** · 11-05-2021, 06:51 PM

Quote:

Originally Posted by hatzie

Thankfully 2005 is too early for VVT.

For the benefit of an old school wrench bender from way back, what the heck is VVT, LOL? Being tech challenged in today's world sure is rough,

57taskforce · 11-05-2021, 08:36 PM

For what it’s worth, most Napa filters are wix rebrands… variable valve timing uses an oil psi controlled cam phaser to manipulate the cam timing within a certain programmed amount of degrees to give the best possible low end torque and high end end Hp, and fuel economy. It wasn’t available on the LS stuff until Gen 4 came out in early 06 in the GMT 900 trucks/suv’s

**67 twins** · 11-08-2021, 10:41 AM

Quote:

Originally Posted by Ironhorse

For the benefit of an old school wrench bender from way back, what the heck is VVT, LOL? Being tech challenged in today's world sure is rough,

Variable Valve Timing

**kwmech** · 11-08-2021, 02:09 PM

Quote:

Originally Posted by Ironhorse

For the benefit of an old school wrench bender from way back, what the heck is VVT, LOL? Being tech challenged in today's world sure is rough,

Pretty sure you haven't been read on the Can-Bus systems then?

**MJN** · 11-09-2021, 11:13 AM

Whether you use synthetic oil or conventional this blog always has great information about a variety topics- you can search for topics too.
https://blog.amsoil.com/5w-20-vs-5w-...he-difference/

10-29-2021, 05:48 PM	#1
Ironhorse Senior Member Join Date: Jul 2001 Location: Wellington, Ks Posts: 10,008	Mixing Oil Weights? Well seems along with every thing else being on the short list the oil I use in my '05 Tahoe 5.3 LS engine is added in locally here. I use the Quaker State Full Synthetic 5W30 Dexos2 per the owner's manual. Usually change my own oil /filter and the first time I changed oil I found out the capacity is SIX quarts not the usual Five I have been used to for so many years. Bummer having to be sure and buy ONE extra quart each time. Also use Wix filters when I change. The Change Oil message has come on the DIC screen several times and I know the oil life percentage has reached 0% within the last week. Oil capacity is good on the dipstick, just about halfway to the first mark below full. Problem is can not find a 5W/30 one quart container. Bought the five quart jug okay, checked three local stores, no single 5W/30 to complete the six needed quarts. Closest I can find is a single 5W20 which I did buy. Thinking can't be much of a difference using the one quart of 5/W20 mixed with the five quarts of 5W/30. Any one care to share thoughts on this. Hate these shortages in everyday products and items needed. __________________ 1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks

10-29-2021, 06:10 PM	#2
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,126	Re: Mixing Oil Weights? I just buy a few jugs and fill an empty quart up from the jugs. __________________ Click on my Not really a build thread, yet NOT SO RUST FREE RUST FREE BLAZER LS ENGINE SWAP INFORMATION THREAD BOLT RESTORATIONS 4l60 to an NP205

11-04-2021, 04:55 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: Mixing Oil Weights? 1 qt of 5w20 wont hurt __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

11-04-2021, 07:21 PM	#5
DPowers One foot in front of the other Join Date: Aug 2008 Location: Parrottsville, TN Posts: 5,423	Re: Mixing Oil Weights? I use the two-quart Wix on my 87. Get it through Amazon and can set it up so an automatic delivery. __________________ DP's 66 Build http://67-72chevytrucks.com/vboard/s...d.php?t=361556

11-05-2021, 12:14 PM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,387	Re: Mixing Oil Weights? Not going to make that much of a difference. What about when you put additives in the oil?? I look at it as the same thing. Been mixing weights for years on the old school stuff. You just have to be careful if you have a VVt system not to get too crazy. Having clean oil to begin with is the number 1

11-05-2021, 05:37 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	Re: Mixing Oil Weights? Thankfully 2005 is too early for VVT. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

11-05-2021, 08:36 PM	#9
57taskforce All about them K’s Join Date: Jun 2014 Location: Farmington, New Mexico Posts: 6,227	Re: Mixing Oil Weights? For what it’s worth, most Napa filters are wix rebrands… variable valve timing uses an oil psi controlled cam phaser to manipulate the cam timing within a certain programmed amount of degrees to give the best possible low end torque and high end end Hp, and fuel economy. It wasn’t available on the LS stuff until Gen 4 came out in early 06 in the GMT 900 trucks/suv’s __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 Last edited by 57taskforce; 11-05-2021 at 08:55 PM.

11-09-2021, 11:13 AM	#12
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,959	Re: Mixing Oil Weights? Whether you use synthetic oil or conventional this blog always has great information about a variety topics- you can search for topics too. https://blog.amsoil.com/5w-20-vs-5w-...he-difference/ __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.